add initial footer to all pages

static/install.html

@@ -11,7 +11,7 @@
         <meta property="og:image" content="https://grapheneos.org/graphene.png"/>
         <meta property="og:url" content="https://grapheneos.org/install"/>
         <meta property="og:site_name" content="GrapheneOS"/>
-        <link rel="stylesheet" href="/grapheneos.css?0"/>
+        <link rel="stylesheet" href="/grapheneos.css?1"/>
         <link rel="manifest" href="/manifest.webmanifest"/>
         <link rel="canonical" href="https://grapheneos.org/install"/>
     </head>
@@ -109,5 +109,11 @@ TMPDIR="$PWD/tmp" ./flash-all.sh</pre>
             Android Verified Boot key to untrust it:</p>
             <pre>fastboot erase avb_custom_key</pre>
         </div>
+        <footer>
+            <a href="/"><img src="https://grapheneos.org/graphene.png" width="697" height="599"/>GrapheneOS</a>
+            <div id="social">
+                <a href="https://twitter.com/GrapheneOS">Twitter</a>
+            </div>
+        </footer>
     </body>
 </html>