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One suggestion I've heard is to encourage your team to write blog posts. The blog posts serve as an open source knowledge base for the organization. This also provides the individual a way to become more well known in and out of the organization (personal branding) and provides the organization a bit of content marketing.

Totally agreed! I've seen this at other startups, and it works great.

At work each team uses the tool that they deem better.

My team (DevOps) have a git repository where we put all our docs, post-mortems, etc...

Other teams uses Confluence, some uses GoogleDocs... etc...

Years ago a place I worked had a team where a manager asked everyone to spend a day documenting stuff. I think it was once every months (??) but they had document stuff all day days.

Yes, just like Gitlab does. [1]

[1] https://about.gitlab.com/handbook