Add project configuration and build assets

- .gitignore: Ignore node_modules, .env, dist, .wrangler
- .env.example: Environment variable template
- package.json, package-lock.json: Tailwind CSS build setup
- src/input.css: Tailwind source file
- style.css: Production Tailwind build
- og-image.png: Open Graph image for social sharing

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,5 @@
+.env
+.wrangler
+node_modules
+dist
+.claude