Remove (unused) tree-sitter-sql
diff --git a/packages/tree-sitter-sql.nix b/packages/tree-sitter-sql.nix
deleted file mode 100644
index 6d7759c..0000000
--- a/packages/tree-sitter-sql.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-{
-  tree-sitter,
-  callPackage,
-  fetchFromGitHub,
-  lib
-}: let
-  version = "218b672499729ef71e4d66a949e4a1614488aeaa";
-in callPackage "${tree-sitter}/grammar.nix" {} {
-  language = "sql";
-  version = builtins.substring 0 7 version;
-  source = fetchFromGitHub {
-    owner = "m-novikov";
-    repo = "tree-sitter-sql";
-    rev = version;
-    hash = lib.fakeSha256;
-  };
-}