🌐 Add German translation for docs/de/docs/how-to/index.md

[nilslindemann]

← deployment/docker.md (#10759)
→ how-to/general.md (#10770)

German translation progress

[nilslindemann]

@tiangolo It seems that squidfunk/mkdocs-material-insiders is now squidfunk/mkdocs-material – the author has removed the -insiders from the name of the repository. Therefore the tests fail:

Collecting git+https://****@github.com/squidfunk/mkdocs-material-insiders.git
  Cloning https://****@github.com/squidfunk/mkdocs-material-insiders.git to /tmp/pip-req-build-wc0ck37j
  Running command git clone --filter=blob:none --quiet 'https://****@github.com/squidfunk/mkdocs-material-insiders.git' /tmp/pip-req-build-wc0ck37j
  fatal: could not read Username for 'https://github.com/': No such device or address

[tiangolo]

📝 Docs preview for commit 4c661ac at: https://d4539440.fastapitiangolo.pages.dev

[tiangolo]

📝 Docs preview for commit 2cf3065 at: https://5e54e649.fastapitiangolo.pages.dev

[nilslindemann]

@tiangolo the coverage test fails (99% < 100%). The function __get_pydantic_core_schema__ in fastapi/openapi/models.py has no coverage.

Edit: Ok, it creates the preview 👍

[tiangolo]

📝 Docs preview for commit 51e309a at: https://68215d3a.fastapitiangolo.pages.dev

[tiangolo]

Awesome @nilslindemann! 🚀

As you are the champion of German translations and you have done so many, and with so much attention to detail, I'm gonna go ahead and merge this. 🎉

If others see things that could be improved later, we can check that in new PRs. 🤓