feat(grfn/system): Resuscitate roswell

Resuscitate the configuration for roswell, the semi-portable
configuration I use for ec2 development boxes. Lots of the changes here
are trying to get Tramp working.

Change-Id: I2dc2fd1d9aa76e145fa3f3f847af761cb652ab47
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5798
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

users/grfn/system/home/modules/emacs.nix

@@ -100,10 +100,7 @@ in
     }
     (mkIf pkgs.stdenv.isLinux {
       # Notes
-      services.syncthing = {
-        enable = true;
-        tray.enable = true;
-      };
+      services.syncthing.enable = true;
     })
   ];
 }