Test theme rebase

Author: Robadob

config.yaml

@@ -93,7 +93,7 @@ profiles:
 # This space below is where custom yaml items (e.g. pinning
 # sandpaper and varnish versions) should live
 
-varnish: RSE-Sheffield/uos-varnish@main
+varnish: RSE-Sheffield/uos-varnish@main_rebase
 url: 'https://rse.shef.ac.uk/pando-python'
 
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