Change Material for MkDocs to Zensical

[supermastergui]

Because the news from Material for MkDocs:
https://squidfunk.github.io/mkdocs-material/blog/2025/11/05/zensical

The Material for MkDocs is in maintenance mode, so i choose the same team's project -- Zensical.
I think it is more modern and the most important is has the Maximum compatibility(you even needn't change anything expect letmkdocs serve/build... to zensical serve/build...).

I already test at at another project, and it it pretty nice, so i request this PR.

Now, you can just pip install zensical and run it at zensical serve.
Also, i add update the python gitignore files.

This is not an advertisement XDDD。

[ltoenning]

Thanks for the PR and bringing this up!

As far as I understand we are not urged to update immediately as critical bugs will still be fixed in the next 12 month (at least for Mkdocs material).
But once I have enough capacity, I will take a look at this!