refactor: sway: port away from home-manager

hosts/common/home/zsh/default.nix

@@ -36,6 +36,8 @@ lib.mkIf config.sane.home-manager.enable
     ".cache/gitstatus"
   ];
 
+  # zsh/prezto complains if zshrc doesn't exist; but it does allow an "empty" file.
+  sane.fs."/home/colin/.config/zsh/.zshrc" = sane-lib.fs.wantedText "# ";
 
   programs.zsh = {
     enable = true;

modules/home-manager/default.nix

@@ -23,12 +23,6 @@ in
       default = {};
       type = types.attrs;
     };
-
-    # extra attributes to include in home-manager's `programs` option
-    sane.home-manager.programs = mkOption {
-      default = {};
-      type = types.attrs;
-    };
   };
 
   config = lib.mkIf cfg.enable {
@@ -49,13 +43,10 @@ in
       home.username = "colin";
       home.homeDirectory = "/home/colin";
 
-      programs = lib.mkMerge [
+      programs = {
-        {
+        # XXX: unsure what this does?
-          # XXX: unsure what this does?
+        home-manager.enable = true;
-          home-manager.enable = true;
+      };
-        }
-        cfg.programs
-      ];
     };
   };
 }