feat: Add tailwind for utility classes (#562)

* feat: Add tailwind for styling

* Use ESM for postcss

* Remove overlapping classes

* More layout fixes

* Pin footer to bottom

* Replace .old-container

* Fix prettier

postcss.config.js

@@ -0,0 +1,10 @@
+// @ts-check
+
+import tailwindcss from 'tailwindcss';
+import autoprefixer from 'autoprefixer';
+
+const config = {
+	plugins: [tailwindcss(), autoprefixer()]
+};
+
+export default config;