add submodules to config

Author: me4502

.readthedocs.yaml

@@ -22,6 +22,10 @@ sphinx:
   # Fail on all warnings to avoid broken references
   # fail_on_warning: true
 
+submodules:
+  include: all
+  recursive: true
+
 # Optionally build your docs in additional formats such as PDF and ePub
 formats:
   - pdf