Revert "Deleted the link to snac on OpenBSD."

This reverts commit 5db10733d5f07e6e513b8ef15325d92195630808.

README.md

@@ -69,6 +69,8 @@ This will:
 
 [Online snac manuals (user, administrator and data formats)](https://comam.es/snac-doc).
 
+[how to run your own ActivityPub server on OpenBSD via snac (by Jordan Reger)](https://futurist.city/~jr/activitypub-server-on-openbsd.html).
+
 ## License
 
 See the LICENSE file for details.