Remove already migrated files from repository

[M-a-r-i-a-n-n-e]

I suggest that already migrated files will be removed from the repository to avoid duplicates.

This might apply, but is not limited, to:
[X] README DE as well as EN (have a look first, if everything is now in https://multigeiger.readthedocs.io )
[ ] The images in the Bilder folder (are they needed any longer? I cannot see any references.)
[ ] The Bauanleitung

@ThomasWaldmann @WwwBoehriDe fyi

[ThomasWaldmann]

In general, a PR should not duplicate stuff (except for specific / very good reasons).

So, if you duplicated content in your PR, you should deduplicate it by removing it at the old position.

[M-a-r-i-a-n-n-e]

@ThomasWaldmann Well, what you say is common knowledge, but obviously this is not the case in this repository, as you can see in the links I provided.

[ThomasWaldmann]

The german README needed copy&pasting into transifex - I did that right now. Now everything from the README-*.md is in our *.rst docs, thus I removed the README-*.md from git in PR #391 .

[ThomasWaldmann]

shifted to next milestone as i did not see anybody actively working on this.