Use sunpy theme for docs

docs/source/conf.py

@@ -22,6 +22,8 @@ copyright = '2022, Aperio Software Ltd'
 author = 'Aperio Software Ltd'
 
 
+from sunpy_sphinx_theme.conf import *  # NOQA
+
 # -- General configuration ---------------------------------------------------
 
 # Add any Sphinx extension module names here, as strings. They can be