overlays: remove tree-sitter overlay

has already been merged into upstream nixpkgs

overlays/default.nix

@@ -6,7 +6,6 @@ builtins.map (path: import path) [
   ./picom.nix
   ./polybar.nix
   ./transcrypt.nix
-  ./tree-sitter.nix
   ./winetricks.nix
   ./xinit.nix
 ]

overlays/tree-sitter.nix

@@ -1,30 +0,0 @@
-self: super:
-let
-  lib = super.lib;
-  stdenv = super.stdenv;
-in {
-  tree-sitter = super.tree-sitter.overrideAttrs(o: {
-    passthru = o.passthru // {
-      withPlugins = grammarFn:
-        let
-          grammars = grammarFn o.passthru.builtGrammars;
-        in
-        super.linkFarm "grammars"
-          (map
-            (drv:
-              let
-                name = lib.strings.getName drv;
-              in
-              {
-                name =
-                  (lib.strings.replaceStrings ["-"] ["_"]
-                    (lib.strings.removePrefix "tree-sitter-"
-                      (lib.strings.removeSuffix "-grammar" name)))
-                  + stdenv.hostPlatform.extensions.sharedLibrary;
-                path = "${drv}/parser";
-              }
-            )
-            grammars);
-    };
-  });
-}