remove vuetifycss and materialicon -> use threeshake

@nuxt/vuetify etc...

pages/add/_edit.vue

@@ -5,7 +5,7 @@
         h4 {{edit?$t('common.edit_event'):$t('common.add_event')}}
         v-spacer
         v-btn(link text color='primary' @click='openImportDialog=true')
-          <v-icon>mdi-file-import</v-icon> {{$t('common.import')}}
+          <v-icon v-text='mdiFileImport'></v-icon> {{$t('common.import')}}
       v-dialog(v-model='openImportDialog' :fullscreen='$vuetify.breakpoint.xsOnly')
         ImportDialog(@close='openImportDialog=false' @imported='eventImported')
 
@@ -23,7 +23,7 @@
                   @change='v => event.title = v'
                   :value = 'event.title'
                   :rules="[$validators.required('common.title')]"
-                  prepend-icon='mdi-format-title'
+                  :prepend-icon='mdiFormatTitle'
                   :label="$t('common.title')"
                   autofocus
                   ref='title')
@@ -49,7 +49,7 @@
               //- tags
               v-col(cols=12 md=6)
                 v-combobox(v-model='event.tags'
-                  prepend-icon="mdi-tag-multiple"
+                  :prepend-icon="mdiTagMultiple"
                   chips small-chips multiple deletable-chips hide-no-data hide-selected persistent-hint
                   :delimiters="[',', ' ']"
                   :items="tags.map(t => t.tag)"
@@ -64,12 +64,8 @@
 <script>
 import { mapActions, mapState } from 'vuex'
 import dayjs from 'dayjs'
-import Editor from '@/components/Editor'
-import List from '@/components/List'
-import ImportDialog from './ImportDialog'
-import DateInput from './DateInput'
-import WhereInput from './WhereInput'
-import MediaInput from './MediaInput'
+
+import { mdiFileImport, mdiFormatTitle, mdiTagMultiple } from '@mdi/js'
 
 export default {
   name: 'NewEvent',
@@ -114,6 +110,7 @@ export default {
     const month = dayjs().month() + 1
     const year = dayjs().year()
     return {
+      mdiFileImport, mdiFormatTitle, mdiTagMultiple,
       valid: false,
       openImportDialog: false,
       event: {