Resolve "Enable docs"

Closes #5 (closed)

.gitlab-ci.yml

@@ -39,8 +39,10 @@ pages:
     - linux
   stage: deploy
   script:
+    - apt update && apt install -y graphviz
     - python3 -m pip install sphinx
-    - sphinx-build -b html docs public
+    - python3 -m pip install -r docs/requirements.txt
+    - sphinx-build -b html docs/source public
   artifacts:
     paths:
       - public