nfs/sftpgo: combine into "exports" nix directory

hosts/by-name/servo/services/default.nix

@@ -7,7 +7,7 @@
     ./email
     ./ejabberd.nix
     ./freshrss.nix
-    ./ftp
+    ./export
     ./gitea.nix
     ./goaccess.nix
     ./ipfs.nix
@@ -18,7 +18,6 @@
     ./lemmy.nix
     ./matrix
     ./navidrome.nix
-    ./nfs.nix
     ./nixserve.nix
     ./nginx.nix
     ./pict-rs.nix

hosts/by-name/servo/services/export/default.nix

@@ -0,0 +1,7 @@
+{ ... }:
+{
+  imports = [
+    ./nfs.nix
+    ./sftpgo.nix
+  ];
+}