option to include card/grid headers in toc tree

[story645]

Context

Hi, over at Matplotlib we maybe overly use cards and grids to organize information, e.g. landing page, contribute page and it's awesome except it makes the right hand navigation panel very sparse.

Proposal

Would it be feasible to add a directive that could tell sphinx to parse the title into a heading level that can then be included in a toctree? something like :toctree-level:? Or a css class variable sd-toctree-level-{}?

Tasks and updates

No response

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