feat(hg): add mercurial static files to backup (#441)

Closes #440

Author: JacobCoffee

pillar/prod/backup/hg.sls

@@ -7,3 +7,10 @@ backup:
       target_user: hg
       frequency: daily
       user: root
+    hg-mercurial-static:
+      source_directory: /usr/share/mercurial/templates/static/
+      target_host: backup.sfo1.psf.io
+      target_directory: /backup/hg-mercurial-static
+      target_user: root
+      frequency: daily
+      user: root