Remove meinberlin specific code related to embedding

[xi]

#53 adds code that is specific for embedding in meinberlin. This feature is currently in a test phase. After the test phase, there are two options:

• Remove the code from this repository and find a way to do embedding in meinberlin without changes to core (e.g. by defaulting to the "external" embed target.)
• Move the embedding feature (most importantly documentation) to core.

Future pull requests that contain similar changes should reference this issue so we can keep track.