DokuWiki is the software you are currently looking at. It is running in a Docker container on tex-drug-den.
All pages are public by default, but pages can be put behind a login by editing the access control list. Admin credentials are stored in Vaultwarden.
You need to be logged in to edit pages. Once logged in, click on 'Page' in the top right and 'Edit this page'.
While editing, use the preview function to see what it will look like, then save. Importantly, this doesn't use markdown; see syntax for a guide on the markup language.
If you're struggling with the syntax, then there is a visual editor extension installed. Press the button below the toolbar to toggle between syntax and visual editing. Please note that the extension, plugin:prosemirror, is labelled as a 'beta'.
Settings like the theme, ACLs, and extensions can be changed by logging in as the admin user.
DokuWiki was chosen for the following reasons: