add nuxt-purgeccs to nuxt config

nuxt.config.js

@@ -35,6 +35,7 @@ export default {
   buildModules: [
     // https://go.nuxtjs.dev/pwa
     '@nuxtjs/pwa',
+    'nuxt-purgecss'
   ],
 
   // Modules: https://go.nuxtjs.dev/config-modules

package.json

@@ -16,10 +16,10 @@
     "chart.js": "^3.6.2",
     "core-js": "^3.15.1",
     "graphql-tag": "^2.12.6",
-    "nuxt": "^2.15.8"
+    "nuxt": "^2.15.8",
+    "nuxt-purgecss": "^1.0.0"
   },
   "devDependencies": {
-    "nuxt-purgecss": "^1.0.0",
     "sass": "^1.45.0",
     "sass-loader": "^10.2.0"
   }