Add colophon

Author: nicknettleton

src/layouts/MasterLayout.astro

@@ -200,7 +200,9 @@ const docTitle = (title.indexOf(SITE_TITLE)) ? `${title} | ${SITE_TITLE}` : titl
             <!-- footer -->
             <footer id="site-footer" class="bg-white p-4 text-sm border-t-1 border-slate-200 text-slate-500 py-4 font-sans">
                 <div class="standard-container">
-                    &copy; {today.getFullYear()} Nick Nettleton. All rights reserved.
+                    &copy; {today.getFullYear()} Nick Nettleton. All rights reserved. |
+                    Built with Astro & Tailwind.
+                    <a href="https://github.com/nicknettleton/nicknettleton.github.io" target="_blank">View Source</a>.
                 </div>
             </footer>
         </div>