Add support for python doc files without rst gallery (#770)

Co-authored-by: Mark Towers <mark.m.towers@gmail.com>

docs/conf.py

@@ -16,6 +16,7 @@ import re
 import sys
 
 import sphinx_gallery.gen_rst
+from furo.gen_tutorials import generate_tutorials
 
 
 # Path setup for building from source tree
@@ -138,6 +139,12 @@ sphinx_gallery_conf = {
     ),
 }
 
+# All tutorials in the tutorials directory will be generated automatically
+# by sphinx-gallery.
+# However, we also want to generate some tutorials without the gallery
+# and to a more specific location so we use this custom function.
+generate_tutorials("introduction/*.py", "./introduction")
+
 # -- Generate Changelog -------------------------------------------------
 
 sphinx_github_changelog_token = os.environ.get("SPHINX_GITHUB_CHANGELOG_TOKEN")