docs: add german publishing document

[krummbar]

Description

Adds publishing documentation in german language. Fixes #2108

Contribution Checklist:

• [x] The pull request only addresses one issue or adds one feature.
• [x] The pull request does not introduce any breaking changes
• [ ] ~~I have added screenshots or gifs to help explain the change if applicable.~~
• [x] I have read the contribution guidelines.
• [x] Create an issue and link to the pull request.

[krummbar]

Some minor suggestions to improve the German translation...

Thanks for your input, applied all of them 👍🏻

[helloanoop]

Merged!

Thank you @krummbar !