📝 Prepare docs for new release

[burgholzer]

Description

This PR just fixes up a couple of things throughout the documentation regarding the move from qmap to mqt-qmap and from the QFR library to MQT Core.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[codecov]

Codecov Report

Merging #360 (7d1347f) into main (6e7ce69) will not change coverage.
Report is 3 commits behind head on main.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main    #360   +/-   ##
=====================================
  Coverage   92.3%   92.3%           
=====================================
  Files         44      44           
  Lines       4155    4155           
  Branches     699     699           
=====================================
  Hits        3837    3837           
  Misses       318     318           

Flag	Coverage Δ
cpp	91.9% <ø> (ø)
python	95.8% <ø> (ø)

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