Update deploy-book.yml

Only run when docs runs

.github/workflows/deploy-book.yml

@@ -4,14 +4,11 @@ name: deploy-book
 on:
   push:
     branches:
-    - main
-    - lesson_content
-    # If your git repository has the Jupyter Book within some-subfolder next to
-    # unrelated files, you can make this run only if a file within that specific
-    # folder has been modified.
-    #
+     - main
+     - lesson_content
     paths:
-    - docs/**
+     - 'docs/**'
+
 
 # This job installs dependencies, builds the book, and pushes it to `gh-pages`
 jobs: