Add User Documentation for AAS Registry, Submodel Registry, Discovery, DTR, CD Repo, AAS Repo

[Martin187187]

This needs to be done in the BaSyx Wiki (see: https://wiki.basyx.org/en/latest/content/user_documentation/basyx_components/go/index.html)

Common documentation like Swagger UI, general config, and common features should not be documented in the individual components.

[Martin187187]

I will do AAS Registry, Submodel Registry, Discovery, DTR

[Martin187187]

still open:

• cd repo
• aas repo