Revert "Bump pydata-sphinx-theme from 0.14.4 to 0.15.1 (#149)" (#155)

This reverts commit 8c02a23.

requirements-doc.txt

@@ -1,7 +1,7 @@
 jupyter_sphinx==0.5.3
 jupyterlab==4.0.10
 numpydoc==1.6.0
-pydata-sphinx-theme==0.15.1
+pydata-sphinx-theme==0.14.4
 pyvista==0.43.1
 sphinx==7.2.6
 sphinx-design==0.5.0