Back in a day I was considering using some paid SaaS for my documentation like Mintlify or Featurebase.
Then I explored some open source alternatives and found mkdocs. I could not be more satisfied. With mkdocs-material I can configure almost anything (of course some technical knowledge is required). It can also be deployed to Github or Gitlab pages wich is super easy!
btw. Mailsyrup docs are out! - https://docs.mailsyrup.com