Use relative API endpoint definitions

Author: ankon

Angular/src/environments/environment.prod.ts

@@ -1,4 +1,4 @@
 export const environment = {
   production: true,
-  API_ENDPOINT: 'https://localhost/api'
+  API_ENDPOINT: '/api'
 };

Angular/src/environments/environment.ts

@@ -5,5 +5,5 @@
 
 export const environment = {
   production: false,
-  API_ENDPOINT: 'http://127.0.0.1:8888/api'
+  API_ENDPOINT: '/api'
 };