docs: update badges

Author: amaanq

README.md

@@ -1,9 +1,16 @@
 # tree-sitter-c
 
-[![CI](https://github.com/tree-sitter/tree-sitter-c/actions/workflows/ci.yml/badge.svg)](https://github.com/tree-sitter/tree-sitter-c/actions/workflows/ci.yml)
-[![Discord](https://img.shields.io/discord/1063097320771698699?logo=discord)](https://discord.gg/w7nTvsVJhm)
-[![Rust Crate](https://img.shields.io/crates/v/tree-sitter-c.svg)](https://crates.io/crates/tree-sitter-c)
-[![Node Package](https://img.shields.io/npm/v/tree-sitter-c.svg)](https://www.npmjs.com/package/tree-sitter-c)
+[![CI][ci]](https://github.com/tree-sitter/tree-sitter-c/actions/workflows/ci.yml)
+[![discord][discord]](https://discord.gg/w7nTvsVJhm)
+[![matrix][matrix]](https://matrix.to/#/#tree-sitter-chat:matrix.org)
+[![crates][crates]](https://crates.io/crates/tree-sitter-c)
+[![npm][npm]](https://www.npmjs.com/package/tree-sitter-c)
 
 C grammar for [tree-sitter](https://github.com/tree-sitter/tree-sitter).
 Adapted from [this C99 grammar](http://slps.github.io/zoo/c/iso-9899-tc3.html).
+
+[ci]: https://img.shields.io/github/actions/workflow/status/tree-sitter/tree-sitter-c/ci.yml?logo=github&label=CI
+[discord]: https://img.shields.io/discord/1063097320771698699?logo=discord&label=discord
+[matrix]: https://img.shields.io/matrix/tree-sitter-chat%3Amatrix.org?logo=matrix&label=matrix
+[npm]: https://img.shields.io/npm/v/tree-sitter-c?logo=npm
+[crates]: https://img.shields.io/crates/v/tree-sitter-c?logo=rust