docs(v2): collapsible categories in sidebar #2251
Merged
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Motivation
From discord:
I previously added the ability to expand all categories in the doc sidebar, as it was in D1 by default, but this was only documented in Migration from v1 to v2 guide, so new users (who did not use Docusaurus at all) did not know about this possibility. This PR documents this feature in the Sidebar page so that all users know about it
Have you read the Contributing Guidelines on pull requests?
Yes
Test Plan
See Sidebar page.
Related PRs
(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)