Implemented Tailwind CSS class list extraction and integrated it into the build process of the frontend package

Hosts/Moonlight.Frontend.Host/Styles/postcss.config.mjs

@@ -1,8 +1,18 @@
-export default {
-    plugins: {
-        "@tailwindcss/postcss": {},
-        "cssnano":{
-            preset: 'default'
-        }
-    }
-}
+import tailwindcss from '@tailwindcss/postcss';
+import cssnano from 'cssnano';
+import extractTailwindClasses from './extract-classes.mjs';
+
+const plugins = [
+    tailwindcss,
+    cssnano({
+        preset: 'default'
+    })
+];
+
+if (process.env.EXTRACT_CLASSES === "true") {
+    plugins.push(extractTailwindClasses());
+}
+
+export default {
+    plugins
+};