Page URLs have .html suffix

[Doug Webb]

Although the Honkit example site manages to avoid this issue without naming every page README.md in it's own nested folder, all the other example pages seem to follow this approach. Those which deviate from this pattern end up with the suffix, e.g. https://www.algorithm-archive.org/contents/barnsley/barnsley.html

Does anyone have an idea how to achieve suffix-free page URLs without the <FolderName>/README.md pattern?