fix: H2->3 in <details> sections

[jorgeorpinel]

so that they don't show up in the right ✋🏼 CONTENT sidebar; E.g.:

Current https://dvc.org/doc/start/data-management/data-versioning

[jorgeorpinel]

Cc @iterative/websites is this the right approach, of should the engine ignore headers from <details> sections? Minor. Thanks

[rogermparent]

I'm honestly not sure what the proper approach would be for this, but if we want to prevent details blocks from showing up in the content nav that could be a totally viable feature- I don't think we deliberately set it to act either way, I think the headers data used for the content nav feature actually comes directly from gatsby-plugin-remark so we don't have great control over it currently.

[github-actions]

bb249ff

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[rogermparent]

Looks alright by me! I'll follow up by discussing a more proper way details headers during next websites meeting. Feel free to give any ideas!

[jorgeorpinel]

It's nor a big deal, prob not worth addressing at this point. On the other hand I keep noticing iterative/gatsby-theme-iterative#38 so may be something to check whether it's easy to fix.