DOC: Improve NEP page layout with nested toctrees #20956
Merged
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A possible solution to #20952 .
The NEP listing is currently generated in individual (unnested) toctrees in a jinja template, which results in the left sidebar showing all the NEPs in whatever order they appear in the various toctrees.
This PR splits out the toctree generation into individual per-category templates that are then referenced in the main toc in the index to produce a nested sidebar organization.