Migrate from mkdocs-material to zensical

[nanxstats]

This PR migrates the documentation site generator framework from mkdocs-material to zensical.

Also migrated the GitHub Actions workflow.

[Copilot]

Pull request overview

This PR migrates the documentation site generator from mkdocs-material to zensical, a newer documentation framework. The migration includes updating configuration files, dependencies, and the GitHub Actions deployment workflow.

Key Changes:

• Replaced mkdocs.yml with zensical.toml for documentation configuration
• Removed mkdocs-material and related dependencies, added zensical as the new documentation generator
• Updated GitHub Actions workflow to use the new zensical build process with GitHub Pages deployment

Reviewed changes

Copilot reviewed 13 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
zensical.toml	New configuration file for zensical documentation framework with project metadata, navigation, theme settings, and plugin configuration
uv.lock	Updated dependency lock file removing mkdocs-material related packages and adding zensical and deepmerge dependencies
pyproject.toml	Updated development dependencies to replace mkdocs-material with zensical, and updated version constraints for other tools
mkdocs.yml	Removed the old mkdocs-material configuration file
.github/workflows/mkdocs.yml	Removed the old mkdocs deployment workflow
.github/workflows/docs.yml	New GitHub Actions workflow for deploying documentation using zensical with GitHub Pages
docs/stylesheets/extra.css	Updated CSS styles with new font configurations and styling for the zensical theme
docs/scripts/sync.sh	Updated comment to reference "Zensical site" instead of "mkdocs"
docs/reference/*.md	Removed mkdocstrings options that are now centrally configured in zensical.toml
docs/index.md	Updated badge reference from "mkdocs" workflow to "Documentation" workflow
README.md	Updated badge reference from "mkdocs" workflow to "Documentation" workflow and minor wording adjustments
.gitignore	Added entry to ignore the /site/ directory generated by zensical

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