Add docs page

[pascalzauberzeug]

Motivation & Implementation

This PR works the mkdocs documentation of the Dev Kit on docs.feldfreund.de.
This branch is already deployed on the site.

Progress

• I chose a meaningful title that completes the sentence: "If applied, this PR will..."
• I chose meaningful labels (if GitHub allows me to so).
• I documented breaking changes and set the 'breaking change' label if needed
• The implementation is complete.
  • Wait for Switch from poetry to uv #13 and update README
  • Wait for Let Odometer extend PoseProvider and rework naming rosys#383
• Tests with a real hardware have been successful (or are not necessary).
• Pytests have been added (or are not necessary).
• Documentation has been added (or is not necessary).

[codingpaula]

Just two comments, otherwise looks good!