pack: add .editorconfig and use tab instead of space

src/renderer/components/layout/HeaderLayout.vue

@@ -1,5 +1,5 @@
 <template>
-  <v-app-bar color="primary" density="compact">
-    <v-app-bar-title>{{ $route.meta.title }}</v-app-bar-title>
-  </v-app-bar>
+	<v-app-bar color="primary" density="compact">
+		<v-app-bar-title>{{ $route.meta.title }}</v-app-bar-title>
+	</v-app-bar>
 </template>