diff --git a/404.html b/404.html
index 5315e3f..ac4b5bb 100644
--- a/404.html
+++ b/404.html
@@ -34,7 +34,7 @@
     <link rel="prefetch" href="/RookieShop/assets/index.html-CnK83yxd.js" as="script"><link rel="prefetch" href="/RookieShop/assets/index.html-C9pf_z5-.js" as="script"><link rel="prefetch" href="/RookieShop/assets/index.html-JBMjy-1f.js" as="script"><link rel="prefetch" href="/RookieShop/assets/photoswipe.esm-GXRgw7eJ.js" as="script"><link rel="prefetch" href="/RookieShop/assets/SearchResult-DDUfJes_.js" as="script">
   </head>
   <body>
-    <div id="app"><!--[--><!--[--><!--[--><span tabindex="-1"></span><a href="#main-content" class="vp-skip-link sr-only">Skip to main content</a><!--]--><!--[--><div class="theme-container no-sidebar external-link-icon has-toc"><!--[--><header id="navbar" class="vp-navbar"><div class="vp-navbar-start"><button type="button" class="vp-toggle-sidebar-button" title="Toggle Sidebar"><span class="icon"></span></button><!----><!--[--><a class="route-link vp-brand" href="/RookieShop/"><img class="vp-nav-logo" src="/RookieShop/logo.png" alt><!----><span class="vp-site-name hide-in-pad">RookieShop</span></a><!--]--><!----></div><div class="vp-navbar-center"><!----><!--[--><!----><!--]--><!----></div><div class="vp-navbar-end"><!----><!--[--><!----><div class="vp-nav-item vp-action"><a class="vp-action-link" href="https://github.com/foxminchan/RookieShop" target="_blank" rel="noopener noreferrer" aria-label="GitHub"><svg xmlns="http://www.w3.org/2000/svg" class="icon github-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="github icon" name="github" style="width:1.25rem;height:1.25rem;vertical-align:middle;"><path d="M511.957 21.333C241.024 21.333 21.333 240.981 21.333 512c0 216.832 140.544 400.725 335.574 465.664 24.49 4.395 32.256-10.07 32.256-23.083 0-11.69.256-44.245 0-85.205-136.448 29.61-164.736-64.64-164.736-64.64-22.315-56.704-54.4-71.765-54.4-71.765-44.587-30.464 3.285-29.824 3.285-29.824 49.195 3.413 75.179 50.517 75.179 50.517 43.776 75.008 114.816 53.333 142.762 40.79 4.523-31.66 17.152-53.377 31.19-65.537-108.971-12.458-223.488-54.485-223.488-242.602 0-53.547 19.114-97.323 50.517-131.67-5.035-12.33-21.93-62.293 4.779-129.834 0 0 41.258-13.184 134.912 50.346a469.803 469.803 0 0 1 122.88-16.554c41.642.213 83.626 5.632 122.88 16.554 93.653-63.488 134.784-50.346 134.784-50.346 26.752 67.541 9.898 117.504 4.864 129.834 31.402 34.347 50.474 78.123 50.474 131.67 0 188.586-114.73 230.016-224.042 242.09 17.578 15.232 33.578 44.672 33.578 90.454v135.85c0 13.142 7.936 27.606 32.854 22.87C862.25 912.597 1002.667 728.747 1002.667 512c0-271.019-219.648-490.667-490.71-490.667z"></path></svg></a></div><div class="vp-nav-item hide-in-mobile"><button type="button" class="vp-color-mode-switch" id="color-mode-switch"><svg xmlns="http://www.w3.org/2000/svg" class="icon auto-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="auto icon" name="auto" style="display:block;"><path d="M512 992C246.92 992 32 777.08 32 512S246.92 32 512 32s480 214.92 480 480-214.92 480-480 480zm0-840c-198.78 0-360 161.22-360 360 0 198.84 161.22 360 360 360s360-161.16 360-360c0-198.78-161.22-360-360-360zm0 660V212c165.72 0 300 134.34 300 300 0 165.72-134.28 300-300 300z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" class="icon dark-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="dark icon" name="dark" style="display:none;"><path d="M524.8 938.667h-4.267a439.893 439.893 0 0 1-313.173-134.4 446.293 446.293 0 0 1-11.093-597.334A432.213 432.213 0 0 1 366.933 90.027a42.667 42.667 0 0 1 45.227 9.386 42.667 42.667 0 0 1 10.24 42.667 358.4 358.4 0 0 0 82.773 375.893 361.387 361.387 0 0 0 376.747 82.774 42.667 42.667 0 0 1 54.187 55.04 433.493 433.493 0 0 1-99.84 154.88 438.613 438.613 0 0 1-311.467 128z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" class="icon light-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="light icon" name="light" style="display:none;"><path d="M952 552h-80a40 40 0 0 1 0-80h80a40 40 0 0 1 0 80zM801.88 280.08a41 41 0 0 1-57.96-57.96l57.96-58a41.04 41.04 0 0 1 58 58l-58 57.96zM512 752a240 240 0 1 1 0-480 240 240 0 0 1 0 480zm0-560a40 40 0 0 1-40-40V72a40 40 0 0 1 80 0v80a40 40 0 0 1-40 40zm-289.88 88.08-58-57.96a41.04 41.04 0 0 1 58-58l57.96 58a41 41 0 0 1-57.96 57.96zM192 512a40 40 0 0 1-40 40H72a40 40 0 0 1 0-80h80a40 40 0 0 1 40 40zm30.12 231.92a41 41 0 0 1 57.96 57.96l-57.96 58a41.04 41.04 0 0 1-58-58l58-57.96zM512 832a40 40 0 0 1 40 40v80a40 40 0 0 1-80 0v-80a40 40 0 0 1 40-40zm289.88-88.08 58 57.96a41.04 41.04 0 0 1-58 58l-57.96-58a41 41 0 0 1 57.96-57.96z"></path></svg></button></div><!--[--><button type="button" class="search-pro-button" aria-label="Search"><svg xmlns="http://www.w3.org/2000/svg" class="icon search-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="search icon" name="search"><path d="M192 480a256 256 0 1 1 512 0 256 256 0 0 1-512 0m631.776 362.496-143.2-143.168A318.464 318.464 0 0 0 768 480c0-176.736-143.264-320-320-320S128 303.264 128 480s143.264 320 320 320a318.016 318.016 0 0 0 184.16-58.592l146.336 146.368c12.512 12.48 32.768 12.48 45.28 0 12.48-12.512 12.48-32.768 0-45.28"></path></svg><div class="search-pro-placeholder">Search</div><div class="search-pro-key-hints"><kbd class="search-pro-key">Ctrl</kbd><kbd class="search-pro-key">K</kbd></div></button><!--]--><!--]--><!----><button type="button" class="vp-toggle-navbar-button" aria-label="Toggle Navbar" aria-expanded="false" aria-controls="nav-screen"><span><span class="vp-top"></span><span class="vp-middle"></span><span class="vp-bottom"></span></span></button></div></header><!----><!--]--><!----><div class="toggle-sidebar-wrapper"><span class="arrow start"></span></div><aside id="sidebar" class="vp-sidebar"><!----><ul class="vp-sidebar-links"><li><a class="route-link auto-link vp-sidebar-link vp-sidebar-page" href="/RookieShop/" aria-label="Introduction"><!---->Introduction<!----></a></li><li><section class="vp-sidebar-group"><p class="vp-sidebar-header"><span class="font-icon icon fa-fw fa-sm fas fa-chart-simple" style=""></span><span class="vp-sidebar-title">Business Analysis</span><!----></p><ul class="vp-sidebar-links"><li><a class="route-link auto-link vp-sidebar-link vp-sidebar-page" href="/RookieShop/model/" aria-label="Business Analysis"><!---->Business Analysis<!----></a></li></ul></section></li><li><section class="vp-sidebar-group"><p class="vp-sidebar-header"><span class="font-icon icon fa-fw fa-sm fas fa-sitemap" style=""></span><span class="vp-sidebar-title">System Design</span><!----></p><ul class="vp-sidebar-links"><li><a class="route-link auto-link vp-sidebar-link vp-sidebar-page" href="/RookieShop/design/" aria-label="System Design"><!---->System Design<!----></a></li></ul></section></li></ul><!----></aside><!--[--><main id="main-content" class="vp-page not-found"><div class="not-found-hint"><p class="error-code">404</p><h1 class="error-title">Page not found</h1><p class="error-hint">How did we get here?</p></div><div class="actions"><button type="button" class="action-button">Go back</button><button type="button" class="action-button">Take me home</button></div></main><!--]--><footer class="vp-footer-wrapper"><div class="vp-footer">RookieShop © Nhan Nguyen</div><div class="vp-copyright">Copyright © 2024 Nhan Nguyen </div></footer></div><!--]--><!--]--><!--[--><!----><!----><!--]--><!--]--></div>
+    <div id="app"><!--[--><!--[--><!--[--><span tabindex="-1"></span><a href="#main-content" class="vp-skip-link sr-only">Skip to main content</a><!--]--><!--[--><div class="theme-container no-sidebar external-link-icon has-toc"><!--[--><header id="navbar" class="vp-navbar"><div class="vp-navbar-start"><button type="button" class="vp-toggle-sidebar-button" title="Toggle Sidebar"><span class="icon"></span></button><!----><!--[--><a class="route-link vp-brand" href="/RookieShop/"><img class="vp-nav-logo" src="/RookieShop/logo.png" alt><!----><span class="vp-site-name hide-in-pad">RookieShop</span></a><!--]--><!----></div><div class="vp-navbar-center"><!----><!--[--><!----><!--]--><!----></div><div class="vp-navbar-end"><!----><!--[--><!----><div class="vp-nav-item vp-action"><a class="vp-action-link" href="https://github.com/foxminchan/RookieShop" target="_blank" rel="noopener noreferrer" aria-label="GitHub"><svg xmlns="http://www.w3.org/2000/svg" class="icon github-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="github icon" name="github" style="width:1.25rem;height:1.25rem;vertical-align:middle;"><path d="M511.957 21.333C241.024 21.333 21.333 240.981 21.333 512c0 216.832 140.544 400.725 335.574 465.664 24.49 4.395 32.256-10.07 32.256-23.083 0-11.69.256-44.245 0-85.205-136.448 29.61-164.736-64.64-164.736-64.64-22.315-56.704-54.4-71.765-54.4-71.765-44.587-30.464 3.285-29.824 3.285-29.824 49.195 3.413 75.179 50.517 75.179 50.517 43.776 75.008 114.816 53.333 142.762 40.79 4.523-31.66 17.152-53.377 31.19-65.537-108.971-12.458-223.488-54.485-223.488-242.602 0-53.547 19.114-97.323 50.517-131.67-5.035-12.33-21.93-62.293 4.779-129.834 0 0 41.258-13.184 134.912 50.346a469.803 469.803 0 0 1 122.88-16.554c41.642.213 83.626 5.632 122.88 16.554 93.653-63.488 134.784-50.346 134.784-50.346 26.752 67.541 9.898 117.504 4.864 129.834 31.402 34.347 50.474 78.123 50.474 131.67 0 188.586-114.73 230.016-224.042 242.09 17.578 15.232 33.578 44.672 33.578 90.454v135.85c0 13.142 7.936 27.606 32.854 22.87C862.25 912.597 1002.667 728.747 1002.667 512c0-271.019-219.648-490.667-490.71-490.667z"></path></svg></a></div><div class="vp-nav-item hide-in-mobile"><button type="button" class="vp-color-mode-switch" id="color-mode-switch"><svg xmlns="http://www.w3.org/2000/svg" class="icon auto-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="auto icon" name="auto" style="display:block;"><path d="M512 992C246.92 992 32 777.08 32 512S246.92 32 512 32s480 214.92 480 480-214.92 480-480 480zm0-840c-198.78 0-360 161.22-360 360 0 198.84 161.22 360 360 360s360-161.16 360-360c0-198.78-161.22-360-360-360zm0 660V212c165.72 0 300 134.34 300 300 0 165.72-134.28 300-300 300z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" class="icon dark-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="dark icon" name="dark" style="display:none;"><path d="M524.8 938.667h-4.267a439.893 439.893 0 0 1-313.173-134.4 446.293 446.293 0 0 1-11.093-597.334A432.213 432.213 0 0 1 366.933 90.027a42.667 42.667 0 0 1 45.227 9.386 42.667 42.667 0 0 1 10.24 42.667 358.4 358.4 0 0 0 82.773 375.893 361.387 361.387 0 0 0 376.747 82.774 42.667 42.667 0 0 1 54.187 55.04 433.493 433.493 0 0 1-99.84 154.88 438.613 438.613 0 0 1-311.467 128z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" class="icon light-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="light icon" name="light" style="display:none;"><path d="M952 552h-80a40 40 0 0 1 0-80h80a40 40 0 0 1 0 80zM801.88 280.08a41 41 0 0 1-57.96-57.96l57.96-58a41.04 41.04 0 0 1 58 58l-58 57.96zM512 752a240 240 0 1 1 0-480 240 240 0 0 1 0 480zm0-560a40 40 0 0 1-40-40V72a40 40 0 0 1 80 0v80a40 40 0 0 1-40 40zm-289.88 88.08-58-57.96a41.04 41.04 0 0 1 58-58l57.96 58a41 41 0 0 1-57.96 57.96zM192 512a40 40 0 0 1-40 40H72a40 40 0 0 1 0-80h80a40 40 0 0 1 40 40zm30.12 231.92a41 41 0 0 1 57.96 57.96l-57.96 58a41.04 41.04 0 0 1-58-58l58-57.96zM512 832a40 40 0 0 1 40 40v80a40 40 0 0 1-80 0v-80a40 40 0 0 1 40-40zm289.88-88.08 58 57.96a41.04 41.04 0 0 1-58 58l-57.96-58a41 41 0 0 1 57.96-57.96z"></path></svg></button></div><!--[--><button type="button" class="search-pro-button" aria-label="Search"><svg xmlns="http://www.w3.org/2000/svg" class="icon search-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="search icon" name="search"><path d="M192 480a256 256 0 1 1 512 0 256 256 0 0 1-512 0m631.776 362.496-143.2-143.168A318.464 318.464 0 0 0 768 480c0-176.736-143.264-320-320-320S128 303.264 128 480s143.264 320 320 320a318.016 318.016 0 0 0 184.16-58.592l146.336 146.368c12.512 12.48 32.768 12.48 45.28 0 12.48-12.512 12.48-32.768 0-45.28"></path></svg><div class="search-pro-placeholder">Search</div><div class="search-pro-key-hints"><kbd class="search-pro-key">Ctrl</kbd><kbd class="search-pro-key">K</kbd></div></button><!--]--><!--]--><!----><button type="button" class="vp-toggle-navbar-button" aria-label="Toggle Navbar" aria-expanded="false" aria-controls="nav-screen"><span><span class="vp-top"></span><span class="vp-middle"></span><span class="vp-bottom"></span></span></button></div></header><!----><!--]--><!----><div class="toggle-sidebar-wrapper"><span class="arrow start"></span></div><aside id="sidebar" class="vp-sidebar"><!----><ul class="vp-sidebar-links"><li><a class="route-link auto-link vp-sidebar-link vp-sidebar-page" href="/RookieShop/" aria-label="Introduction"><!---->Introduction<!----></a></li><li><section class="vp-sidebar-group"><p class="vp-sidebar-header"><span class="font-icon icon fa-fw fa-sm fas fa-chart-simple" style=""></span><span class="vp-sidebar-title">Business Analysis</span><!----></p><ul class="vp-sidebar-links"><li><a class="route-link auto-link vp-sidebar-link vp-sidebar-page" href="/RookieShop/model/" aria-label="Business Analysis"><!---->Business Analysis<!----></a></li></ul></section></li><li><section class="vp-sidebar-group"><p class="vp-sidebar-header"><span class="font-icon icon fa-fw fa-sm fas fa-sitemap" style=""></span><span class="vp-sidebar-title">System Design</span><!----></p><ul class="vp-sidebar-links"><li><a class="route-link auto-link vp-sidebar-link vp-sidebar-page" href="/RookieShop/design/" aria-label="System Design"><!---->System Design<!----></a></li></ul></section></li></ul><!----></aside><!--[--><main id="main-content" class="vp-page not-found"><div class="not-found-hint"><p class="error-code">404</p><h1 class="error-title">Page not found</h1><p class="error-hint">That’s a Four-Oh-Four.</p></div><div class="actions"><button type="button" class="action-button">Go back</button><button type="button" class="action-button">Take me home</button></div></main><!--]--><footer class="vp-footer-wrapper"><div class="vp-footer">RookieShop © Nhan Nguyen</div><div class="vp-copyright">Copyright © 2024 Nhan Nguyen </div></footer></div><!--]--><!--]--><!--[--><!----><!----><!--]--><!--]--></div>
     <script type="module" src="/RookieShop/assets/app-Cdid9Vez.js" defer></script>
   </body>
 </html>
