docs: package-manager tabs (npm/pnpm/bun/yarn) for CLI install

Use a Mintlify CodeGroup so the global-install command is shown per package manager.

Author: RhysSullivan

apps/docs/local/cli.mdx

@@ -11,10 +11,26 @@ policies stay local.
 
 Requires Node.js 20 or newer.
 
-```bash
+<CodeGroup>
+
+```bash npm
 npm install -g executor
 ```
 
+```bash pnpm
+pnpm add -g executor
+```
+
+```bash bun
+bun add -g executor
+```
+
+```bash yarn
+yarn global add executor
+```
+
+</CodeGroup>
+
 ## Start the service
 
 Install the durable background service, then open the web UI: