docs: split index into 3 static HTML pages (Welcome, API, Articles)

[GarthDB]

Splits the Leonardo docs index page into three static HTML pages with real navigation instead of JS-toggled content.

Changes:

• Welcome → index.html (existing route, now static)
• Leonardo JS API → api.html
• Articles → articles.html

Implementation:

• New home_sidenav_links.html partial with <a href> links; side nav highlights current page via home.js
• New home.js for doc pages (dark mode, page loader, nav active state)
• index.html rewritten to use header_home, home_sidenav_links, and only home_main content
• theme.html, scales.html, tools.html unchanged

GitHub Actions: No workflow changes needed. Deploy already runs moon run ui:buildSite and uploads docs/ui/dist/; the new pages are included in the Vite build output.

Made with Cursor

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1963184

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[github-actions]

Run report for 19631848

Total time: 27.5s | Comparison time: 25.3s | Estimated loss: 2.3s (8.2% slower)

	Action	Time	Status	Info
⬛️	SetupProto(0.52.3)	0.1ms	Skipped
🟩	SyncWorkspace	7.7ms	Passed
🟩	SyncProject(contrast-colors)	0.3ms	Passed
🟩	SyncProject(ui)	0.3ms	Passed
⬛️	SetupToolchain(node:24.0.0)	1.3s	Skipped
🟩	InstallWorkspaceDeps(node:24.0.0)	0.3ms	Passed
🟩	RunTask(ui:lint)	2s	Passed
🟩	RunTask(ui:buildSite)	26.2s	Passed

Touched files

docs/ui/src/api.html
docs/ui/src/articles.html
docs/ui/src/home.js
docs/ui/src/index.css
docs/ui/src/index.html
docs/ui/src/views/header_home.html
docs/ui/src/views/home_sidenav_links.html
docs/ui/vite.config.js