Bug#1084781: pydata-sphinx-theme missing templates etc

[Rebecca N. Palmer]

Probably neither of those are the actual problem - my attempt disabled 
css-minimizer-webpack-plugin and changed the expected node_version, 
which avoided both of those issues, but there were other unrelated(?) 
problems:
https://salsa.debian.org/rnpalmer-guest/pydata-sphinx-theme/-/commit/e6f035a2745dc7cb9cc9d341f183b8475693f22c