fix: Add Tailwind directives and import main.css in nuxt.config

assets/css/main.css

@@ -1 +1,5 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
 @import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

nuxt.config.ts

@@ -1,6 +1,7 @@
 export default defineNuxtConfig({
   compatibilityDate: '2024-04-03',
   devtools: { enabled: false },
+  css: ['~/assets/css/main.css'],
   modules: [
     '@nuxt/ui'
   ],