chore: migrate postcss configuration to TypeScript

Author: nelsonlaidev

postcss.config.mjs

@@ -0,0 +1,9 @@
+import type { Config } from 'postcss-load-config'
+
+const config: Config = {
+  plugins: {
+    '@tailwindcss/postcss': {},
+  },
+}
+
+export default config