vite configs

sth-frontend/postcss.config.js

+module.exports = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}

sth-frontend/vite.config.js

+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+
+export default defineConfig(() => {
+    return {
+        build: {
+            outDir: 'build',
+        },
+        plugins: [react()],
+    };
+});
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