I've stuck with Git based markdown wikis. Nice thing is that when the web app you were relying on enevitably dies the data format is portable.
Currently using Gitea's built in per-repo wiki as a general wiki after we migrated from Gitlab to self hosted Gitea. As a bonus there's no maintenance burden, Gitea itself has super low maintenance burden, single portable binary (I use an APT repo), single config. Latency of Navigating Gitea is also instant by comparison to Gitlab which was driving us nuts it's so slow.
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