docs: include Homebrew installation instructions

documentation/docs/getting-started/installation.md

@@ -40,6 +40,8 @@ import RateLimits from '@site/src/components/RateLimits';
         :::
       </TabItem>
       <TabItem value="ui" label="Goose Desktop">
+        Install Goose directly from the browser or with [Homebrew](https://brew.sh/).
+        <h3 style={{ marginTop: '1rem' }}>(Option 1) Install via browser</h3>
         To install Goose, click the **button** below:
         <div className="pill-button">
           <Link
@@ -57,7 +59,14 @@ import RateLimits from '@site/src/components/RateLimits';
           :::tip Updating Goose
           It's best to keep Goose updated. To update, reperform installation steps.
           :::
-
+        </div>
+        <h3>(Option 2) Install via Homebrew</h3>
+        Homebrew downloads the [same app](https://github.com/Homebrew/homebrew-cask/blob/master/Casks/b/block-goose.rb) but can take care of updates too. 
+        ```bash
+          brew install --cask block-goose
+        ```
+        ---
+        <div style={{ marginTop: '1rem' }}>
           :::note Permissions
             If you’re on an Apple Mac M3 and the Goose desktop app shows no window on launch, check and update the following: