Introduce build automation for generated docs

[tuxalp]

Components of the build automation framework:

• pyproject.toml configured with setuptools (https://setuptools.pypa.io/en/latest/)
• docs are generated with python -m build (can be run locally)
• setup.py in the root project acts as the interface for the build (where we can add tools to be run during the build)
• The build writes all output to a new directory ("site"), excluded from git
• The new Github Action pages.yaml runs a script tools/build.sh (can also be run/tested locally) which runs the build via python -m build and uploads the generated docs to GitHub Pages

[ue71603]

This PR is not mergable:

• You deleted the old workflow (already prior to the PR) ci.yml. This would have shown you a lot about handling the branches.
• It does not make the toolchain work, but only one element. When I ue build_all.bat two processes break.
• pages.yaml still starts with an inappropriate comment.
• already in main branch: the usage of configuration.py broke the toolchain as it was not applied over everything.
• The readme.md about uv is not really done in the way one should do stuff.How to install, how to load.

So as the PR is incomplete and breaking the toolchain, I don't have a look at this PR again, until it is really finished and documented.