docs: add homebrew installation instructions (#329)

website/src/content/docs/guides/manual-installation.mdx

@@ -11,6 +11,13 @@ Or in other words, Biome shouldn't be the only reason for you to have a `package
 > Note: If you're already using npm or another package manager, then using the package manager is the [preferred way to install](/guides/getting-started#installation) Biome.
 You're already familiar with the tooling, and installing and updating are simpler.
 
+### Homebrew
+
+Biome is available as a [Homebrew formula](https://formulae.brew.sh/formula/biome) for macOS and Linux users.
+
+```shell
+brew install biome
+```
 
 ## System Requirements