doc: restore sphinxbootstrap4theme in doc requirements

Author: ntamas

doc/source/conf.py

@@ -17,13 +17,14 @@
 import os
 import importlib
 from pathlib import Path
-import sphinxbootstrap4theme
 
 
 # Check if we are inside readthedocs, the conf is quite different there
 is_inside_rtd = os.getenv("READTHEDOCS", "") == "True"
 rtd_version = os.getenv("READTHEDOCS_VERSION", "")
 
+if not is_inside_rtd:
+    import sphinxbootstrap4theme
 
 # Utility functions
 # NOTE: these could be improved, esp by importing igraph, but that

doc/source/requirements.txt

@@ -2,6 +2,7 @@ pip
 wheel
 requests>=2.28.1
 
+sphinxbootstrap4theme
 sphinx-gallery
 sphinx-rtd-theme
 sphinxcontrib-jquery