Add placeholder for empty projects

.gitignore

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+/dist/
+/node_modules/
+.parcel-cache

.postcssrc

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+{
+  "plugins": {
+    "tailwindcss": {}
+  }
+}

README.md

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+# Gumbo's Not Available pages
+
+Simple pages using the Gumbo Tailwind branding to display that sites are offline.
+
+## Usage
+
+1. `git clone https://github.com/gumbo-misc/not-available.git`
+2. `npm install`
+3. `npm run build`
+
+Done!
+
+See [nginx.conf](./nginx.conf) for an example nginx config.
+
+## License
+
+No license yet, all rights reserved.

nginx.conf

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+server {
+    listen 80;
+    server_name example.com;
+
+    root /var/www/unavailable;
+    index index.html;
+
+    # Use index.html as the error page
+    error_page 404 /index.html;
+
+    # Disallow access to hidden files
+    location ~ /\.ht {
+        deny all;
+    }
+
+    # Add immutable cache headers to hashed css, js and svg files
+    location ~* \.([a-f0-9]{8})\.(?:css|js|svg)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}