Add sphinx-toolbox as a dependency for collapsible options

Author: ArBridgeman

doc/conf.py

@@ -33,6 +33,7 @@
     "sphinx.ext.napoleon",
     "sphinx.ext.intersphinx",
     "sphinx.ext.autosummary",
+    "sphinx_toolbox.collapse",
     "sphinx_copybutton",
     "myst_parser",
     "sphinx_design",