Because my blog has been getting a lot of spam, I am going to enforce a new rule in the meantime. I will disallow http/1.0 and http/1.1 traffic. In order to use http2, use a modern browser (Chrome >79, Firefox >53). Or, use this link to see which specific versions of browsers you can use with http2.
In addition to the above server change, it appears that the theme "Default theme" is broken. In order to fix it, I recommend changing your theme to theme-dark or theme-light.