update ci

.gitlab-ci.yml

 image: python:3.9-slim-buster
 
 stages:
-  - build
-  - deploy
+    - build
+    - deploy
 
 before_script:
-  - pip install jupyter nbconvert
+    - pip install jupyter nbconvert
 
 build_notebooks:
-  stage: build
-  script:
-    - mkdir -p public
-    - jupyter nbconvert --to html notebooks/*.ipynb --output-dir=public
-
+    stage: build
+    script:
+        - mkdir -p public
+        - jupyter nbconvert --to html notebooks/*.ipynb --output-dir=public
+    artifacts:
+        paths:
+            - public
+        
 pages:
-  stage: deploy
-  artifacts:
-    paths:
-      - public
-  only:
-    - master
+    stage: deploy
+    script:
+        - echo "Deploying Pages"
+    artifacts:
+        paths:
+            - public
+    only:
+        - master