fix: Correct links in getting_started.md

[benjaminhuth]

PLEASE DESCRIBE YOUR CHANGES.
THIS MESSAGE ENDS UP AS THE COMMIT MESSAGE.
DO NOT USE @-MENTIONS HERE!

--- END COMMIT MESSAGE ---

Any further description goes here, @-mentions are ok here!

• Use a conventional commits prefix: quick summary
  • We mostly use feat, fix, refactor, docs, chore and build types.
• A milestone will be assigned by one of the maintainers

[paulgessinger]

I think the links are correct, but the getting started page is potentially not linked in the doc at the moment.

[benjaminhuth]

Hmm I think this cannot work when coming to the getting_started.md from the github README.md view, because it tries to link to a local anchor...

[paulgessinger]

Where do we get there from GitHub?

Ah, from the README. I suppose that should link to the rendered documentation then? Otherwise we could also keep that part of the documentation outside of doxygen.

[benjaminhuth]

Yeah, that would probably be good