closes#3855
unlike #3854, this implementation uses a generic details html tag and a bit of tailwind magic...
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## Maintainers Note
- previously tailwind classes of the form `[-a-zA-Z:0-9_.]` was disabled, however they were enabled since they were required for the `group-open:` classes
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## Manual Testing
1. Visit the code search results after submitting a valid query for repo (if indexer disabled) or repo, user, explore (if indexer enabled)
2. Verify thst
1. the results are unfloded/open by default
2. the chevron points down when open and right when closed
<video src="/attachments/5a55c56f-6159-4422-ab80-962e0121e7d2" title="fold2.mp4" controls></video>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/4134
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Reviewed-by: Beowulf <beowulf@noreply.codeberg.org>
Co-authored-by: Shiny Nematoda <snematoda.751k2@aleeas.com>
Co-committed-by: Shiny Nematoda <snematoda.751k2@aleeas.com>
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