Migrate from mkdocs to properdocs
- Replace mkdocs-with-pdf + weasyprint with properdocs>=1.6.7
- Add pymdown-extensions for richer markdown support
- Remove heavy apt dependencies (weasyprint, fonts-noto-cjk, wget, unzip)
- Switch build command from 'mkdocs build' to 'properdocs build --strict'
- Update template: add offline plugin, fix palette, add content.code.select/copy
- Add md_in_html, pymdownx.tilde, emoji, mermaid, annotation icon support
- Fix broken icon path material//weather-sunny
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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