More secure custom authentication solution (#126)

* Remove Nuxt Auth from the project, and switch to a custom solution

* Replace old testing code

* Remove warnings

* Add comments to hard to understand function calls in middleware

* Use arrow functions

package.json

@@ -12,17 +12,16 @@
     "lint": "npm run lint:js"
   },
   "dependencies": {
-    "@nuxtjs/auth": "^4.9.1",
     "@nuxtjs/axios": "^5.12.5",
     "@nuxtjs/dayjs": "^1.2.0",
     "@nuxtjs/google-adsense": "^1.3.0",
     "@nuxtjs/robots": "^2.4.2",
     "@nuxtjs/sitemap": "^2.4.0",
     "@nuxtjs/style-resources": "^1.0.0",
+    "cookie-universal-nuxt": "^2.1.4",
     "highlight.js": "^10.3.2",
     "marked": "^2.0.0",
     "nuxt": "^2.14.7",
-    "nuxt-clipboard2": "^0.2.1",
     "v-tooltip": "^2.0.3",
     "vue-click-outside": "^1.1.0",
     "vue-highlightjs": "^1.3.3",