favicon in config

_config.yml

@@ -55,9 +55,11 @@ repository:
   # path_to_book: docs  # Optional path to your book, relative to the repository root
   branch: master  # Which branch of the repository should be used when creating links (optional)
 
+# HTML specific settings
 # Add GitHub / GitLab buttons to your book
 # See https://jupyterbook.org/customize/config.html#add-a-link-to-your-repository
 html:
+  favicon: "content/images/favicon.ico"
   use_issues_button: true
   use_repository_button: true
   comments: