The Android App needs a full rewrite to be up to date with 4.x

[mmattel]

The current documentation is heavily outdated and needs a full rewrite to be up to date. This includes:

• Content
• Images
• Functionalities
• Infinite Scale / Server

Supercedes: #127, #86, #62

Complexity: 8

[mmattel]

Doc Board Meeting
@michaelstingl pls create issues for your single change requests.