update flake, add frontend package

tank-frontend/vite.config.ts

@@ -3,12 +3,10 @@ import react from '@vitejs/plugin-react';
 
 // https://vitejs.dev/config/
 export default defineConfig(() => {
-    const isContainer = process.env.CONTAINERMODE;
     return {
         plugins: [react()],
 
         build: {
-            outDir: isContainer ? undefined : '../tanks-backend/TanksServer/client',
             emptyOutDir: true
         }
     };