ActivityPub by definition doesn't work with a static site. But check out this project which offloads the ActivityPub parts for any site assuming you can make a

ActivityPub by definition doesn't work with a static site. But check out this project which offloads the ActivityPub parts for any site assuming you can make a request there as part of your static site build process https://fed.brid.gy/ https://fed.brid.gy/