Update 404.md

Author: AniruddhaAdak

_pages/404.md

@@ -6,7 +6,19 @@ sitemap: false
 permalink: /404.html
 ---
 
-Sorry, but the page you were trying to view does not exist --- perhaps you can try searching for it below.
+# Oops! Page Not Found
+
+Sorry, but the page you were trying to view does not exist. Perhaps you can try searching for it below or return to the [homepage](/).
+
+<form action="/search" method="get" role="search">
+  <input type="search" name="q" aria-label="Search site" placeholder="Search the site...">
+  <button type="submit">Search</button>
+</form>
+
+Or you can check out some of our popular pages:
+- [Home](/)
+- [Getting Started](/getting-started)
+- [Contact Us](/contact)
 
 <script type="text/javascript">
   var GOOG_FIXURL_LANG = 'en';