Isn’t that the beauty of a website/domain — you can stream the version that’s right for the user?
Deliver firstly from a marketing/beginner perspective, a working example of a very basic wiki, that offers step by step instruction with screenshots etc. using only the default editor toolbar options.
Provide links to a similar enhanced version, that brings in the next level of customisations — the ones that require the user to learn inline HTML/CSS… and then another more advanced version, and so on. Always allowing the option to delve as deeply as you like or need, into your own fully customised wiki.