A fair few of us using static sites use https://webmention.io as our webmention server, and then you have the choice of how you want to display them. I used to do it on site builds, but moved to dynamically doing it with client-side JavaScript for a more up-to-date feel as mentioned in https://www.jvt.me/posts/2019/06/30/client-side-webmentions/
by 
Jamie Tanna
.