Add docs, blog, community pages and polish landing page layout

- Add docs pages (getting-started, changelog, keyboard-shortcuts)
- Add blog, community, and legal pages (privacy, terms, EULA)
- Add site header, footer, download button, and nav components
- Add sitemap and robots.txt generation
- Narrow main page container (max-w-2xl), fix footer positioning
- Switch README feature list to colon style

web/package.json

@@ -12,7 +12,9 @@
     "next": "16.1.6",
     "next-themes": "^0.4.6",
     "react": "19.2.3",
-    "react-dom": "19.2.3"
+    "react-dom": "19.2.3",
+    "react-wrap-balancer": "^1.1.1",
+    "shiki": "^3.22.0"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",