No point of holding empty host point only

If hosts source their configuration themselves, they can do it on
.config/imapdomo level.

dotfiles/config/imapdomo/host/README

@@ -1 +0,0 @@
-put host-specific configs here

dotfiles/config/imapdomo/private/README

@@ -1,4 +0,0 @@
-Keep here only files that are never to leave the particular
-machine ie. never to be backed up or synchronized.
-
-This folder should be auto-ignored by all such tools.