Squashed commit of the following:

commit de84e76d
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Jan 16 13:59:57 2025 +0100

    fix name of nox session

commit 3920b82d
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Jan 16 13:56:25 2025 +0100

    Fix CI yaml. Add notes on Python env.

commit f96049fc
Merge: 227d81f4 f797e579
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Jan 16 13:39:30 2025 +0100

    Merge branch 'fhennig/examples' of i10git.cs.fau.de:da15siwa/sfg-walberla into fhennig/examples

commit 227d81f4
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Jan 16 13:39:27 2025 +0100

    rename examples to user_manual. Set up CI task for building it.

commit f797e579
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Jan 16 13:26:08 2025 +0100

    Extend PrepareSFG CMake module

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