[kattni]

Converts the toga-chart documentation build from MkDocs and Material for MkDocs to Zensical, using Zensical-native configuration.

This depends on beeware/beeware-docs-tools#288. docs-tools is temporarily pinned to that PR's branch (kattni/beeware-docs-tools@tooling/zensical-migration) in the docs dependency group; the pin will be reverted to beeware/main once #288 is merged.

Changes

• docs/config.yml and docs/mkdocs.en.yml are replaced by docs/zensical.toml and docs/zensical.en.toml, generated with docs-tools' convert_mkdocs_config. Its equivalence check reported the converted configuration as equivalent to the YAML (the only note was the order of the Markdown extensions).
• docs/en/SUMMARY.md (literate-nav) is replaced by the native nav setting in docs/zensical.toml. New pages now need to be added to nav by hand.
• pyproject.toml: docs-tools pinned to the migration branch (temporary), and docs/en/SUMMARY.md removed from the rumdl exclude list.
• tox.ini: removed the MkDocs-only DISABLE_MKDOCS_2_WARNING / NO_MKDOCS_2_WARNING settings, and the --source-code arguments, which docs-tools now ignores.
• .gitignore: ignores the generated docs/_build.*.toml files.

Verification

• tox -r -e docs,docs-lint builds in strict mode with no issues, and the spelling check passes.
• Compared with a MkDocs build of main:
  • The same 38 pages, with identical titles, heading ids, sidebar, tabs and footer navigation.
  • Article text is identical on 32 pages. The other 6 are contribution-guide pages from docs-tools' shared content, which now describes editing nav in zensical.toml instead of SUMMARY.md, and refers to Zensical instead of MkDocs.
  • The API reference (toga_chart.Chart) renders identically, and objects.inv, sitemap.xml and the images are byte-identical.
  • Visually the same in light and dark mode, apart from Zensical's more compact search box.

Notes for reviewers

• No open questions for toga-chart.
• Before merging, the docs-tools pin needs to be reverted to beeware/main once Migrate the documentation tooling to Zensical beeware-docs-tools#288 has merged.

PR Checklist:

• I will abide by the BeeWare Code of Conduct
• I have read and have followed the CONTRIBUTING.md file
• This PR was generated or assisted using an AI tool

Assisted-by: Claude Code (Claude Opus 5.5)