Switch from Material for MkDocs to Zensical

[ryanlua]

Migrates the documentation from Material for MkDocs to Zensical.

MkDocs version 2 is bleak, and Material for MkDocs is no longer maintained. It's a good time to migrate to alternatives.

[Copilot]

Pull request overview

Migrates the documentation site from MkDocs Material (mkdocs.yml) to Zensical (zensical.toml) and updates the CI/CD + dev tooling accordingly to build/deploy via GitHub Pages.

Changes:

• Replace MkDocs Material configuration with a new zensical.toml config and adjust markdown pages for Zensical (page front matter/icons).
• Update GitHub Actions docs workflow to build with zensical build --clean and deploy via GitHub Pages actions.
• Remove MkDocs-related editor/devcontainer settings and replace docs assets (favicon/logo) with purse.svg.

Reviewed changes

Copilot reviewed 14 out of 18 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
zensical.toml	New Zensical site configuration (nav/theme/features/markdown extensions).
mkdocs.yml	Removes legacy MkDocs Material configuration.
docs/index.md	Adds page front matter for Zensical icon metadata.
docs/installation.md	Adds front matter and adjusts section heading formatting.
docs/guide.md	Adds front matter for icon metadata.
docs/performance.md	Adds front matter for icon metadata.
docs/philosophy.md	Adds front matter for icon metadata.
docs/api-reference.md	Adds front matter (title + icon).
docs/assets/purse.svg	Adds new SVG asset used as logo/favicon.
docs/assets/logo.svg	Removes old logo asset.
docs/assets/favicon.svg	Removes old favicon asset.
.vscode/settings.json	Removes MkDocs YAML schema/custom tags config.
.vscode/extensions.json	Removes YAML extension recommendation; keeps Luau tooling.
.gitignore	Renames MkDocs-specific ignore comment to generic docs wording.
.github/workflows/docs.yml	Switches from mkdocs gh-deploy to Zensical build + Pages deploy workflow.
.github/workflows/ci.yml	Minor formatting/whitespace normalization in steps.
.github/workflows/release.yml	Minor formatting/whitespace normalization in steps and tag pattern quoting.
.devcontainer/devcontainer.json	Replaces MkDocs install with Zensical install; updates forwarded port label.

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