chore(frontend): migrate to tailwindcss v3

frontend/postcss.config.js

@@ -1,17 +1,6 @@
-const purgecss = require("@fullhuman/postcss-purgecss")({
-  // Specify the paths to all of the template files in your project
-  content: ["./public/**/*.html", "./src/**/*.tsx"],
-
-  // Include any special characters you're using in this regular expression
-  defaultExtractor: (content) => content.match(/[\w-/:]+(?<!:)/g) || [],
-});
-
 module.exports = {
-  plugins: [
-    require("postcss-import"),
-    require("tailwindcss"),
-    require("autoprefixer"),
-
-    ...(process.env.NODE_ENV === "production" ? [purgecss] : []),
-  ],
-};
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}