Handbook: Internet resources: list archives

Make the FreeBSD-provided search interface primary.

Add MarkMail.

https://bugs.freebsd.org/264754

264754

documentation/content/en/books/handbook/eresources/_index.adoc

@@ -97,8 +97,9 @@ Before posting to any list, please:
 
 Archive search interfaces include: 
 
-* https://www.freebsd.org/search/[] (DuckDuckGo)
-* https://lists.freebsd.org/search[] (Experimental search engine)
+- https://lists.freebsd.org/search[] (FreeBSD, experimental)
+- https://www.freebsd.org/search/[] (DuckDuckGo)
+- https://freebsd.markmail.org/[] (MarkMail)
 
 Note that this also means that messages sent to FreeBSD mailing lists are archived in perpetuity.
 When protecting privacy is a concern, consider using a disposable secondary email address and posting only public information.