docs: fix contributing guide (#122)

Author: shinGangan

docs/content/docs/1.getting-started/5.contributing.md

@@ -16,7 +16,7 @@ navigation.icon: i-ph-git-pull-request-duotone
 After cloning the repo, you can prepare your environments with
 
 ```sh
-pnpm i
+pnpm i && pnpm dev:prepare
 ```
 
 ## Running the playground