Add documentation for Android Media Controls feature - #1304

Changed pages include:

• index.html - view
• 404.html - view
• download/index.html - view
• search/index.html - view
• docs/android-auto/index.html - view
• docs/apple-watch/index.html - view
• docs/carplay/index.html - view
• docs/core/index.html - view
• docs/getting_started/index.html - view
• docs/integrations/index.html - view

There are more changes not included in the list