NimForum 2.2.0 - Fixes a big CVE!

[Yardanico]

I do like Nimforum, but I also agree with @exelotl about the Nimforum v2 that 
is based on Karax and is a SPA being too heavy. I might be a bit biased but I 
still prefer forums that don't need JS to at least show threads and posts, and 
sadly it's not possible to do that with pure Karax (without other JS 
frameworks) - it's either all rendered server-side or all rendered with JS.