git-worktree-switcher: remove shell integrations

They're redundant, given that the packages already install the
completion files through `installShellCompletion`.

modules/programs/git-worktree-switcher.nix

@@ -4,36 +4,23 @@ let
   inherit (lib) mkEnableOption mkPackageOption optionalString;
 
   cfg = config.programs.git-worktree-switcher;
-
-  initScript = shell:
-    if (shell == "fish") then ''
-      ${lib.getExe pkgs.git-worktree-switcher} init ${shell} | source
-    '' else ''
-      eval "$(${lib.getExe pkgs.git-worktree-switcher} init ${shell})"
-    '';
 in {
   meta.maintainers = with lib.maintainers; [ jiriks74 mateusauler ];
 
+  imports = lib.flip builtins.map [ "Bash" "Fish" "Zsh" ]
+    (shell: mkRemovedOptionModule [
+      "programs"
+      "git-worktree-switcher"
+      "enable${shell}Integration"
+    ] ''
+      The completion files for `git-worktree-switcher` are already installed in
+      the package, and should be installed alongside it.
+    '');
+
   options.programs.git-worktree-switcher = {
     enable = mkEnableOption "git-worktree-switcher";
     package = mkPackageOption pkgs "git-worktree-switcher" { };
-    enableBashIntegration =
-      lib.hm.shell.mkBashIntegrationOption { inherit config; };
-
-    enableFishIntegration =
-      lib.hm.shell.mkFishIntegrationOption { inherit config; };
-
-    enableZshIntegration =
-      lib.hm.shell.mkZshIntegrationOption { inherit config; };
   };
 
-  config = lib.mkIf cfg.enable {
-    home.packages = [ cfg.package ];
-    programs.bash.initExtra =
-      optionalString cfg.enableBashIntegration (initScript "bash");
-    programs.fish.interactiveShellInit =
-      optionalString cfg.enableFishIntegration (initScript "fish");
-    programs.zsh.initExtra =
-      optionalString cfg.enableZshIntegration (initScript "zsh");
-  };
+  config = lib.mkIf cfg.enable { home.packages = [ cfg.package ]; };
 }