Fix broken tailwindcss/postcss referencing (#64)

Author: Jibola

{{cookiecutter.project_slug}}/frontend/app/assets/css/main.css

@@ -1,3 +1,4 @@
+@import "tailwindcss";
 @tailwind base;
 
 html,
@@ -9,4 +10,4 @@ body,
 }
 
 @tailwind components;
-@tailwind utilities;
+@tailwind utilities;

{{cookiecutter.project_slug}}/frontend/postcss.config.js renamed to {{cookiecutter.project_slug}}/frontend/postcss.config.mjs

@@ -1,6 +1,9 @@
-module.exports = {
+const config = {
   plugins: {
-    autoprefixer: {},
     '@tailwindcss/postcss': {},
+    autoprefixer: {},
   },
+
 };
+
+export default config;