Trying to help out few non-techie people, but I'm also interested personally...

How do you make few static HTML files available online for free?

I looked at

• Google Site -- you can't upload html file
• Dropbox -- it shows you the text content of HTML files.
• GitHub -- same thing.

Failing that, I'm considering

• Put the files on USB stick, and plug it into router.  It has web/file server.  I would have to register DDNS, though.
• Set up web server on a Linux computer.  But, I don't want to be "tech support".