Android - Support for universal link

[RodriSanchez1]

Close #1140

The new feature introduces the ability to open the Android app directly from a link which contains cboard host. If it is a board, the app will prompt the copy public board message o redirect to the existing board. A new plugin was added for this feature ionic-deep-linlk

Also in index.html some meta tags were added to integrate this new feature with the Facebook app. If the user has installed the cboard app on their device, it will open . Otherwise, the Play Store will open with the cboard app listed.