Use Vuepress to generate a static site for docs.

package.json

@@ -5,14 +5,17 @@
     "dev": "nuxt dev",
     "generate": "nuxt generate",
     "preview": "nuxt preview",
-    "postinstall": "nuxt prepare"
+    "postinstall": "nuxt prepare",
+    "docs:dev": "vuepress dev docs",
+    "docs:build": "vuepress build docs"
   },
   "devDependencies": {
     "@kevinmarrec/nuxt-pwa": "^0.17.0",
     "@nuxtjs/color-mode": "^3.2.0",
     "@nuxtjs/i18n": "^8.0.0-beta.9",
     "material-design-icons-iconfont": "^6.7.0",
-    "nuxt": "^3.3.3"
+    "nuxt": "^3.3.3",
+    "vuepress": "^2.0.0-beta.61"
   },
   "dependencies": {
     "@microsoft/fetch-event-source": "^2.0.1",