[Docs] Translated "CLI" documentation to German (#7178)

[Docs] Translated "CLI" documentation to German (#7178)

* Translated "CLI" documentation to German

> * Weise den User an, die Umgebungs-Variable `QMK_HOME` zu setzen, um die Firmware-Quelle anders einzustellen als `~/qmk_firmware`.
- I wasn't quite sure with this translation, as I didn't understand the context in the original English docs.
- The link to the CLI Configuration page is currently not working, due to it being missing in German.

* Update docs/de/cli.md - typo

* Update docs/de/cli.md - added Installation option into documentation

* Update docs/de/cli.md - changed article for CLI

* Update docs/de/cli.md Spelling

* Update docs/de/cli.md Spelling

* Update docs/de/cli.md de-anglicization

* Update docs/de/cli.md Spelling

* Update docs/de/cli.md Synonym

* Update docs/de/cli.md Added Installation option

* Cleaned up installation option duplicate

Co-Authored-By: kuchosauronad0 <22005492+kuchosauronad0@users.noreply.github.com>