Add 'help' screen

[pocmo]

Add 'help' screen

[pocmo]

iOS Version: Showing a SUMO page in a full-screen WebView.

[pocmo]

It looks like the iOS version is linking to:

• Focus: https://support.mozilla.org/en-US/kb/focus (I wonder why always en_US?)
• Klar: https://support.mozilla.org/products/klar (Which is empty in English for example)

[bbinto]

1. @jonisavage, could you please create another SUMO page just for Focus Android.

2. Once that's done, Sebastian, is it possible to manipulate the HTML page and hide the header/footer/comments?

Basically, only the content between
-- START ---
This page describes
...
Version history
--- END ---

And while loading the page, show a loading spinner?

[pocmo]

For removing the header/footer I filed #283 and marked it as nice to have. As soon as we are close to feature complete we can try to do that.

[pocmo]

Bugzilla duplicate: https://bugzilla.mozilla.org/show_bug.cgi?id=1348553

[pocmo]

URLs:

• https://docs.google.com/spreadsheets/d/1utt7lgWClxyl6LdnkLFEtFZH7wf-nBg5MTbFfuZLgf4/edit#gid=0

[pocmo]

I added the URLs from the doc. If there's no URL for the current locale we fall-back to using English.