If it's an HTML then nothing fancy is needed, the files just need uploading the webroot on the webserver and that's it really. May have to rename the default file to index.html if they don't want to mess with other settings.Hey Feebs there is another Dev on here looking to put his game online is there anyway we could help him with who to contact????
They can even host and play directly on itch.io if the total size is below 1gb or 500mb (can't quite remember which) which can make life a lot easier if they don't want to pay for their own host.