add code group with pnpm back

Author: lawreka

installation.mdx

@@ -24,10 +24,16 @@ icon: "terminal"
   <Step title="Install the CLI.">
     Run the following command to install the [CLI](https://www.npmjs.com/package/mint):
 
-    ```bash
+  <CodeGroup>
+    ```bash npm
     npm i -g mint
     ```
 
+    ```bash pnpm
+    pnpm i -g mint
+    ```
+  </CodeGroup>
+
   </Step>
   <Step title="Preview locally.">
     Navigate to your docs directory (where your `docs.json` file is located) and execute the following command:
@@ -137,6 +143,8 @@ If you use JetBrains, we recommend the [MDX IntelliJ IDEA plugin](https://plugin
   </Accordion>
   <Accordion title="mintlify vs. mint package">
     If you have any problems with the CLI package, you should first run `npm ls -g`. This command shows what packages are globally installed on your machine.
+
+    If you don't use npm or don't see it in the -g list, try `which mint` to locate the installation.
 
     If you have a package named `mint` and a package named `mintlify` installed, you should uninstall `mintlify`.