Feature/style unification (#420)

* set global icons

* fixes #419

* button style docs

* category/tag page updates

* dynamic router imports

Co-authored-by: hay-kot <hay-kot@pm.me>

frontend/src/pages/Admin/ManageUsers/TheSignUpTable.vue

@@ -31,7 +31,7 @@
         <v-card>
           <v-app-bar dark dense color="primary">
             <v-icon left>
-              mdi-account
+              {{ $globals.icons.user }}
             </v-icon>
 
             <v-toolbar-title class="headline">
@@ -83,7 +83,7 @@
         <template v-slot:item.actions="{ item }">
           <v-btn class="mr-1" small color="error" @click="deleteItem(item)">
             <v-icon small left>
-              mdi-delete
+              {{ $globals.icons.delete }}
             </v-icon>
             {{ $t("general.delete") }}
           </v-btn>