Remove different UI kits

Leave one of UI kits, pbbly we have unused ones, see `package.json`:
```json
  "dependencies": {
    "@nuxt/typescript-runtime": "^1.0.0",
    "@nuxtjs/vuetify": "^1.11.3",
    "bootstrap-vue": "^2.15.0",
    "eslint-plugin-prettier-vue": "^3.0.0",
    "nuxt": "^2.14.0",
    "typeit": "^7.0.4",
    "vuex": "latest",
    "workbox-background-sync": "^6.1.2"
  },
```