DOC: Mock rdkit when building docs

docs/conf.py

@@ -253,6 +253,11 @@
 # Defaults to False.
 napoleon_use_admonition_for_references = True
 
+# This value contains a list of modules to be mocked up.
+# This is useful when some external dependencies are not met at build time and break the building
+# process. You may only specify the root package of the dependencies themselves and
+# omit the sub-modules:
+autodoc_mock_imports = ["rdkit"]
 
 # A string of reStructuredText that will be included at the end of every source file that is read.
 # This is a possible place to add substitutions that should be available in every file (another being rst_prolog).