Switch to make commands for build workflow

This is for consistency with the PR-testing workflow so that the same
nbconvert options are used in both situations.

This does drop the exclude on conesearch.

Author: jonathansick

.github/workflows/build.yml

@@ -29,11 +29,11 @@ jobs:
 
       - name: Execute the notebooks
         run: |
-          nbcollection execute --timeout=600 --flatten --build-path=. -v tutorials --exclude=conesearch  # TODO: remove this exclude!
+          make executeall
 
       - name: Convert the notebooks to HTML
         run: |
-          nbcollection convert --flatten --build-path=. -v --make-index --index-template=templates/index.tpl tutorials --exclude=conesearch  # TODO: remove this exclude!
+          make convertall
 
       - name: Name artifact
         id: nameartifact