Add landing page and Claude terminal launch screenshot

Pixel art brutalist Next.js landing page at site/ with Tailwind,
Silkscreen pixel font, Tokyo Night palette, terminal window
components, animated demo GIF, feature grid, keybinding table,
install instructions, launch flow visualization, and author section
with obfuscated email. Domain: claudm.com.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

site/postcss.config.mjs

@@ -0,0 +1,7 @@
+const config = {
+  plugins: {
+    "@tailwindcss/postcss": {},
+  },
+};
+
+export default config;