Remove app installation instructions

index.html

@@ -210,33 +210,6 @@ chown -R <strong>username</strong>:<strong>username</strong> ~<strong>username</
             </div>
           </div>
         </div>
-        <div class="panel" data-state="collapsed">
-          <div class="panel-heading">
-            <h4 class="panel-title">
-              <a class="accordion-toggle" ng-click="toggleAccordion($event)">
-                Install app
-              </a>
-            </h4>
-          </div>
-          <div id="collapseFour" class="panel-collapse collapse">
-            <div class="panel-body">
-              <p>You don't need to install anything to use Glowing Bear, it works with any modern browser. Start using it <a data-toggle="collapse" data-parent="#accordion" href="#collapseOne">right now</a> at the top of the page! However, there are a few ways to improve integration with your operating system.</p>
-              <h3>Mobile Applications</h3>
-              <p>If you're running Android 4.4 or later, you can install our app from the Google Play Store! We can't distribute on iOS unfortunately, but if you're a developer, you can <a href="https://github.com/glowing-bear/glowing-bear-cordova">follow the sideloading instructions</a>.</p>
-              <p><a href="https://play.google.com/store/apps/details?id=com.glowing_bear"><img alt="Android app on Google Play" src="assets/img/badge_playstore.png" /></a></p>
-              <h3>Electron</h3>
-              <p>Glowing Bear supports the electron shell. You'll have to build it yourself, though. Run the following commands, choosing your platform from the list in the last command: <pre>git clone https://github.com/glowing-bear/glowing-bear
-cd glowing-bear
-npm install
-npm install electron-packager
-npm run build-electron-{windows, darwin, linux}</pre>
-              <h3>Firefox Browser</h3>
-              <p>Firefox used to support apps, but this was removed from Firefox. There's nothing we can do about it. Sorry!</p>
-              <h3>Chrome</h3>
-              <p>To install Glowing Bear as an app in Chrome for Android, select <kbd>Menu - Add to home screen</kbd>. In the desktop version of Chrome, click <kbd>Menu - More tools - Create application shortcuts</kbd>.</p>
-            </div>
-          </div>
-        </div>
         <div class="panel" data-state="collapsed">
           <div class="panel-heading">
             <h4 class="panel-title">