adding doxyen folder artifact

.gitlab-ci.yml

@@ -28,7 +28,7 @@ doc:
     name: cpp_tools_doc
     expire_in: 1 day
     paths:
-      - build/docs/html
+      - build/docs/doxygen/html
   script:
     - cd build && make doc
 
@@ -41,6 +41,6 @@ pages:
       - public
   script:
     - mkdir public
-    - mv build/docs/html/* public/
+    - mv build/docs/doxygen/html/* public/
   only:
     - master