I'm using Azure, with the bonus if that if you want you can apply to BizSpark and get 3 years of free software and servers. Uploading an MVP should be easy.

It's an amazing service for startups, and it's gotten more Linux and OSS-friendly.

https://bizspark.microsoft.com/

Some resources:

https://blogs.msdn.microsoft.com/msgulfcommunity/2013/04/08/...

https://cmatskas.com/getting-started-with-microsoft-azure-ru...

Edit: that said, for basic HTML it's probably overkill, I haven't tried Gitlab or similar but it should do.

For a proof of concept, maybe a landing page generator like Unbounce? http://unbounce.com/