update angular proxy configuration

Author: Alexander Bainczyk

frontend/src/main/javascript/angular.json

@@ -69,7 +69,8 @@
         "serve": {
           "builder": "@angular-devkit/build-angular:dev-server",
           "options": {
-            "browserTarget": "alex-frontend:build"
+            "browserTarget": "alex-frontend:build",
+            "proxyConfig": "proxy.conf.js"
           },
           "configurations": {
             "production": {

frontend/src/main/javascript/proxy.conf.js

@@ -0,0 +1,5 @@
+module.exports = {
+  context: ["/rest"],
+  target: "http://localhost:8000",
+  secure: false
+};