Docs: Revamp extensions site (#1260)

Co-authored-by: Nahiyan Khan <nahiyan@squareup.com>

documentation/plugins/tailwind-config.cjs

@@ -0,0 +1,15 @@
+function tailwindPlugin(context, options) {
+    return {
+      name: 'tailwind-plugin',
+      configurePostCss(postcssOptions) {
+        postcssOptions.plugins = [
+          require('postcss-import'),
+          require('tailwindcss'),
+          require('autoprefixer'),
+        ];
+        return postcssOptions;
+      },
+    };
+  }
+  
+  module.exports = tailwindPlugin;