Implemented REST Mock tool

Co-authored-by: widlam <mikolaj.widla@gmail.com>
Co-authored-by: Adam Bem <adam.bem@zoho.eu>
Reviewed-on: #231
Reviewed-by: Adam Bem <bema@noreply.example.com>
Co-authored-by: Mikolaj Widla <widlam@noreply.example.com>
Co-committed-by: Mikolaj Widla <widlam@noreply.example.com>

docker-compose.yml

@@ -7,7 +7,9 @@ services:
         restart: "no"
 
     xmltools-frontend:
-        build: ./Frontend
+        build:
+            context: ./Frontend
+            target: production-stage
         container_name: xmltools-frontend
         image: xmltools-frontend
         ports: