Update .gitlab-ci.yml

.gitlab-ci.yml

+stages:
+  - build
+  - deploy
+  - pdfs
+
+
 build_mkdocs:
   image: jtr0/mkdocs-material:dev
   stage: build 
@@ -28,12 +34,13 @@ pages:
 
 generate_pdfs:
   image: jtr0/latex-pandoc
-  stage: .post
+  stage: pdfs
   only:
     - main
   script:
     - ls
     - pwd
+    - mkdir public/pdfs/
     - ls public/
     - ls data/
     - cp -r docs/imgs imgs