I am going through the ikiwiki docs on this website, and I get confused by the docs' insistence of referring to markdown as "mdwn" files. Mdwn files are normal markdown files, am I right? Can ikiwiki understand and work with .md files, instead of mdwn?

Yes, ikiwiki can work with .md files just fine. The file extension is conventionally named after the plugin that parses the markup so that it's trivial to find it's name. — awesomeadam, 2023-06-13