feat:#43 added vue dev tools

frontend/vite.config.ts

@@ -22,6 +22,7 @@ import {resolve as pathResolver} from "path";
 import terser from "@rollup/plugin-terser";
 import ViteSSGOptions from "vite-ssg";
 import generateSitemap from 'vite-ssg-sitemap'
+import vueDevTools from 'vite-plugin-vue-devtools'
 
 const hostname = "https://cal.htwk-leipzig.de";
 
@@ -31,6 +32,7 @@ export default defineConfig({
     vue(),
     resolve(),
     terser(),
+    vueDevTools(),
   ],
   resolve: {
     alias: