This page was certainly created and published by Johan as it was signed with his Keybase key.
This page is the result of the awesomely instant Markdown-to-HTML-to-the-Internet-publishing thanks to the amazing people of Keybase.
It was rendered from a simple markdown file. Publishing securily and trustworthy content has never been easier. Create a Keybase account and install the Keybase application on your computer and create an index.md or index.html in your public keybase folder and presto, you have a secure website.
It might not be entirely 100% pure valid HTML, but most browsers will render it just fine.
If you'd like to test out Keybase, Johan has a couple of invites. Just ping him on Twitter.