Updates contents

Author: gokulkrishh

src/Header.js

@@ -10,7 +10,7 @@ class Header extends Component {
             <path d="M6 36h36v-4H6v4zm0-10h36v-4H6v4zm0-14v4h36v-4H6z"></path>
           </svg>
         </div>
-        <h3>Codelabs</h3>
+        <h3>Progressive Web Application</h3>
       </header>
     );
   }

src/Menu.css

@@ -15,6 +15,11 @@
   transform: translateX(-103%);
 }
 
+.menu__header {
+  display: flex;
+  align-items: center;  
+}
+
 .menu__logo {
   width: 50px;
   height: 50px;

src/Menu.js

@@ -62,7 +62,9 @@ class Menu extends Component {
     return(
       <div className="menu-container">
         <div className="menu">
-          <img className="menu__logo" src={codelabsImg} alt="logo" />
+          <div className="menu__header">
+            <img className="menu__logo" src={codelabsImg} alt="logo" />
+          </div>
           <ul className="menu__list">
             <li>
               <NavLink to="/introduction" onlyActiveOnIndex={true}>

src/step-1/Introduction.js

@@ -22,10 +22,11 @@ class Introduction extends Component {
 
         <p><b>What you will learn</b></p>
         <ul>
-          <li>Whats is a Service worker and its lifecycle</li>
-          <li>How to cache resources and serve it when offline</li>
-          <li>Push notifications</li>
-          <li>Background sync</li>
+          <li>App Shell Architecture</li>
+          <li>Service Worker and its lifecycle</li>
+          <li>Caching the resources</li>
+          <li>Offline</li>
+          <li>Native app like features.</li>
         </ul>
 
         <p><b>Things you need</b></p>