docs: remove other tooling not currently ported for Alloy

Other tooling, such as the treesitter grammar, is not officially
maintained by the Alloy developers and so it's being temporarily removed
from the documentation until an Alloy equivalent exists that we can link
to.

docs/sources/concepts/config-language/_index.md

@@ -114,12 +114,5 @@ You can use one or all of the following tools to help you write configuration fi
   * [Vim/Neovim](https://github.com/grafana/vim-alloy)
 * Code formatting using the [`agent fmt` command][fmt]
 
-You can also start developing your own tooling using the {{< param "PRODUCT_ROOT_NAME" >}} repository as a go package or use the
-[tree-sitter grammar][] with other programming languages.
-
 [RFC]: https://github.com/grafana/agent/blob/97a55d0d908b26dbb1126cc08b6dcc18f6e30087/docs/rfcs/0005-river.md
-[vim]: https://github.com/rfratto/vim-river
-[VSCode]: https://github.com/rfratto/vscode-river
-[river-mode]: https://github.com/jdbaldry/river-mode
-[tree-sitter grammar]: https://github.com/grafana/tree-sitter-river
 [fmt]: ../../reference/cli/fmt/