Add landing page + Starlight docs site (#375)

* udpated matrix

* feat(site): add landing page + Starlight docs site

Astro + Starlight site in site/ — a flat/paper editorial landing page
plus 18 docs pages seeded from the README. Monochrome theme, hairline
rules, square corners, live GitHub star count, light default + dark
toggle. Deploys to GitHub Pages via .github/workflows/deploy-site.yml.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

site/src/content/docs/reference/languages.md

@@ -0,0 +1,30 @@
+---
+title: Languages
+description: Every language CodeGraph parses, and the extensions it recognizes.
+---
+
+Language support is automatic from the file extension — there's nothing to configure.
+
+| Language | Extensions | Status |
+|---|---|---|
+| TypeScript | `.ts`, `.tsx` | Full support |
+| JavaScript | `.js`, `.jsx`, `.mjs` | Full support |
+| Python | `.py` | Full support |
+| Go | `.go` | Full support |
+| Rust | `.rs` | Full support |
+| Java | `.java` | Full support |
+| C# | `.cs` | Full support |
+| PHP | `.php` | Full support |
+| Ruby | `.rb` | Full support |
+| C | `.c`, `.h` | Full support |
+| C++ | `.cpp`, `.hpp`, `.cc` | Full support |
+| Swift | `.swift` | Full support |
+| Kotlin | `.kt`, `.kts` | Full support |
+| Scala | `.scala`, `.sc` | Full support (classes, traits, methods, type aliases, Scala 3 enums) |
+| Dart | `.dart` | Full support |
+| Svelte | `.svelte` | Full support (script extraction, Svelte 5 runes, SvelteKit routes) |
+| Vue | `.vue` | Full support (script + script-setup, Nuxt page/API/middleware routes) |
+| Liquid | `.liquid` | Full support |
+| Pascal / Delphi | `.pas`, `.dpr`, `.dpk`, `.lpr` | Full support (classes, records, interfaces, enums, DFM/FMX forms) |
+| Lua | `.lua` | Full support (functions, methods, locals, `require` imports, call edges) |
+| Luau | `.luau` | Full support (Lua, plus typed signatures, `type` aliases, Roblox `require`) |