Which "wiki folder" do you refer to? Are you talking about Wiki.JS, or some other wiki engine? I see you mention MediaWiki, are your simple steps for it?
When you click to download DokuWiki, MediaWiki, etc. you are downloading a folder that contains the application as well as an install.php script.
My steps work for all 5 of the wikis I tried before I settled on MediaWiki (though I don't necessarily recommend it to everyone). The install.php script might be in some subfolder, but the website instructions will tell you.
Neither DokuWiki nor MediaWiki (via sqlite) needed to have an external DB running, though some wikis do depend on MySQL.
It was just a quick summary to show how easy it is. e.g. PHP has an embedded server these days.
