frontend: streamline frontend build process in prepare script

frontend/angular.json

@@ -42,6 +42,12 @@
 							"clearScreen": true
 						},
 						"production": {
+							"outputPath": {
+								"base": "../backend/public",
+								"browser": ""
+							},
+							"deleteOutputPath": true,
+							"clearScreen": true,
 							"budgets": [
 								{
 									"type": "initial",

prepare.sh

@@ -14,14 +14,14 @@ npm install
 npm run build:prod
 cd ..
 
+# Build frontend
+cd frontend
+npm install
+npm run build:prod
+cd ..
+
 # Build webcomponent
 cd frontend/webcomponent
 npm install
 npm run build
-cd ../..
-
-# Build frontend
-cd frontend
-npm install
-# npm run lib:build
-cd ..
+cd ../..