Releasenotes v8.23

[StephanStS]

Remarks:

• Run pip3 install -Ur requirements.txt to update the Docs base
• Run python3 -m pip install --upgrade pip to update pip

Further work:
Executing mkdocs serve gives an INFO message:

INFO    -  DeprecationWarning: A plugin has set File.page to an instance of Page and it got overwritten. The behavior of this will
           change in MkDocs 1.6.
             File "/home/schultze/.local/lib/python3.11/site-packages/mkdocs/structure/nav.py", line 183, in <listcomp>
               _data_to_navigation((key, value), files, config)
             File "/home/schultze/.local/lib/python3.11/site-packages/mkdocs/structure/nav.py", line 209, in _data_to_navigation
               warnings.warn(