add styles from kontor-api to kontor-vue

kontor-vue/src/App.vue

@@ -1,10 +1,12 @@
 <script setup lang="ts">
 import { RouterView } from 'vue-router'
+import MainHeader from '@/components/MainHeader.vue'
 import MainNavbar from '@/components/MainNavbar.vue'
 </script>
 
 <template>
   <header>
+    <MainHeader headerTitle="Kontor"/>
     <MainNavbar />
   </header>