Fixed menu to contain also iOS. (#1851)

* Fixed menu to contain also iOS.

Because article it also about iOS.

* Changed URL in link.

* Renamed android page to mobile.

* Added redirect_from for mobile page from old path.

* Fixed formatting in mobile page.

source/getting-started/mobile.markdown

@@ -0,0 +1,33 @@
+---
+layout: page
+title: "Getting started on Mobile"
+description: "Android/iOS instructions to add Home Assistant to your homescreen."
+date: 2015-03-08 21:36
+sidebar: true
+comments: false
+sharing: true
+footer: true
+redirect_from: /getting-started/android/
+---
+
+Home Assistant is not available on the Play Store or App Store. Instead, Home Assistant leverages the new W3C [manifest.json](https://w3c.github.io/manifest/) support, allowing mobile devices to add the "web app" to your homescreen as if it was native.
+
+# On Android:
+
+  1. Open Chrome
+  2. Navigate to your Home Assistant instance
+  3. Tap on the Menu icon (three vertical bars)
+  4. Tap on Add to Homescreen
+  5. A dialog will popup; tap on Add
+
+<p class='img' style='width:500px; margin-left: auto; margin-right: auto;'>
+<img src='/images/screenshots/android-homescreen-guide.gif' />
+</p>
+
+# On iOS:
+
+  1. Open Safari
+  2. Navigate to your Home Assistant instance
+  3. Tap on the Share icon in the middle of the bottom toolbar
+  4. Tap on "Add to Home Screen"
+  5. A dialog will popup; tap on Add