Add to Home Screen icons

[mitogh]

Steps to reproduce and a minimal demo of the problem

We need to include the meta information to add the site into the Home screen of an iOS or Android device.

Current behavior

This information is not present.

Expected/desired behavior

Have this information

Other information

// iOS
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="App Title">

// Android (same as above)
<meta name="mobile-web-app-capable" content="yes"> 

This is related to #23

<meta name="theme-color" content="#E64545">