Add missing PostCSS config for Tailwind CSS

- Add postcss.config.js (required for Tailwind CSS processing)
- This fixes the missing CSS styling on the website
- Tailwind CSS should now be properly compiled and applied

Author: thaddeus

postcss.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}