Add missing keyboard shortcuts on landing page

Fixes #80

index.html

@@ -111,6 +111,9 @@
                   <li>ALT+l: Focus on input bar</li>
                   <li>ALT-[0-9]: Focus on buffer</li>
                   <li>ALT-a: Focus on next buffer with activity</li>
+                  <li>CTRL+G: Focus on buffer list filter</li>
+                  <li>escape: disconnect</li>
+                  <li>arrow keys: history navigation</li>
                 </ul>
                 </div>
               </div>