feat: add doc versioning with starlight-versions

- Install starlight-versions plugin for version dropdown UI
- Archive current stable docs as v1.0.5 (slug: 1.0)
- Current/latest version labeled v2.0-alpha
- Add new alpha feature docs: SSH, cohorts, RBAC, audit logging, sprouts
- Update glossary with cross-references to new pages
- Update sidebar with Security section and new pages
- Upgrade to Astro 6, Starlight 0.38, starlight-tailwind 5, ESLint 10
- Migrate content config to src/content.config.ts with loaders
- Fix all prettier formatting issues

package.json

@@ -10,20 +10,21 @@
     "astro": "astro"
   },
   "dependencies": {
-    "@astrojs/starlight": "^0.37.6",
-    "@astrojs/starlight-tailwind": "^4.0.2",
+    "@astrojs/starlight": "^0.38.1",
+    "@astrojs/starlight-tailwind": "^5.0.0",
     "@fontsource/ibm-plex-mono": "^5.2.7",
     "@fontsource/ibm-plex-sans": "^5.2.8",
     "@fontsource/ibm-plex-serif": "^5.2.7",
     "@tailwindcss/vite": "^4.2.1",
-    "astro": "^5.18.0",
+    "astro": "^6.0.4",
     "sharp": "^0.34.5",
+    "starlight-versions": "^0.8.1",
     "tailwindcss": "^4.2.1"
   },
   "devDependencies": {
-    "@typescript-eslint/parser": "^8.56.1",
+    "@typescript-eslint/parser": "^8.57.0",
     "astro-eslint-parser": "^1.3.0",
-    "eslint": "^9.39.3",
+    "eslint": "^10.0.3",
     "eslint-plugin-astro": "^1.6.0",
     "prettier": "^3.8.1",
     "prettier-plugin-astro": "^0.14.1",