docs: correct theme, plugin registry and docs license drift

[datlechin]

Why

Several docs pages state things that are not true today. The appearance page points at community themes, but the registry lists no themes. The plugin registry page says the registry lives in TablePro's repository, then says it lives in TableProApp/plugins. The plugin development page points at a pluginkit-v* release that was never published. docs/LICENSE is Mintlify's starter MIT text, and STYLE.md is served as a public page.

Change

• Appearance: themes install from the plugin registry, with no claim about community themes.
• Plugin Registry: one account of where plugins.json lives and who writes it, matching the TableProApp/plugins README. Also notes that a custom manifest replaces the official one.
• Plugin Development: build the XCFramework from a release tag, since no prebuilt one is published.
• Delete docs/LICENSE, so the docs fall under the repository's AGPLv3. docs/README.md gets a License section that keeps the name and logo out of it.
• .mintignore drops STYLE.md from the site.

Verified

verify.sh docs and mint broken-links --check-anchors pass. Release and tag lists have no pluginkit-* entry. The live plugins.json has 24 entries and no themes.

[mintlify]

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Project	Status	Preview	Updated
TablePro	🟢 Ready	View Preview	Oct 10, 2026, 9:02 AM

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