plugins: add top-level deprecation file

- Initialize it with the `treesitter-playground` removal

plugins/default.nix

@@ -93,7 +93,6 @@
     ./languages/treesitter/hmts.nix
     ./languages/treesitter/rainbow-delimiters.nix
     ./languages/treesitter/treesitter-context.nix
-    ./languages/treesitter/treesitter-playground.nix
     ./languages/treesitter/treesitter-refactor.nix
     ./languages/treesitter/treesitter-textobjects.nix
     ./languages/treesitter/treesitter.nix
@@ -248,5 +247,7 @@
     ./utils/yanky.nix
     ./utils/zellij.nix
     ./utils/zk.nix
+
+    ./deprecation.nix
   ];
 }

plugins/deprecation.nix

@@ -0,0 +1,22 @@
+{ lib, ... }:
+let
+  removed = {
+    # Added 2023-08-29
+    treesitter-playground = ''
+      The `treesitter-playground` plugin has been deprecated since the functionality is included in Neovim.
+      Use:
+      - `:Inspect` to show the highlight groups under the cursor
+      - `:InspectTree` to show the parsed syntax tree ("TSPlayground")
+      - `:PreviewQuery` to open the Query Editor (Nvim 0.10+)
+    '';
+  };
+in
+{
+  imports = lib.mapAttrsToList (
+    name:
+    lib.mkRemovedOptionModule [
+      "plugins"
+      name
+    ]
+  ) removed;
+}

plugins/languages/treesitter/treesitter-playground.nix

@@ -1,21 +0,0 @@
-{ lib, ... }:
-with lib;
-{
-  # Deprecation notice added 2023/08/29
-  # TODO: remove (along with this file) in early November 2023.
-  imports = [
-    (mkRemovedOptionModule
-      [
-        "plugins"
-        "treesitter-playground"
-      ]
-      ''
-        The `treesitter-playground` plugin has been deprecated since the functionality is included in Neovim.
-        Use:
-        - `:Inspect` to show the highlight groups under the cursor
-        - `:InspectTree` to show the parsed syntax tree ("TSPlayground")
-        - `:PreviewQuery` to open the Query Editor (Nvim 0.10+)
-      ''
-    )
-  ];
-}