restructure pipeline

.gitlab-ci.yml

 stages:
-    - test
+    - test-frontend
+    - test-backend
     - staging
 
 test-frontend:
   image: node:latest
-  stage: test
+  stage: test-frontend
   script:
     # Configure browser
     - apt-get update -yqqq
-    - apt-get install -yqq xvfb
-    - apt-get install iceweasel -yqq
+    #- apt-get install -yqq xvfb
+    #- apt-get install iceweasel -yqq
     - apt-get install dbus-x11 -yqq
     - Xvfb :99 -screen 0 1280x720x24 -ac &
     - export DISPLAY=:99
     - export $(dbus-launch)
 
     # Install dependencies
-    - npm install 
+    #- npm install
     - npm install -g testcafe
     - testcafe --list-browsers
     
@@ -25,7 +26,7 @@ test-frontend:
 
 test-backend:
   image: python:3.8
-  stage: test
+  stage: test-backend
   script:
     - cd backend/secfit
     - apt-get update -qy