Docs: Add dbt adapter link to install page (#1176)

* Add dbt adapter link to install page

* Format link text

Author: treysp

docs/installation.md

@@ -15,4 +15,5 @@ pip install sqlmesh
 ```
 
 ## Next steps
-* [Jump right in with the quickstart](quick_start.md)
+* Jump right in with the [quickstart example project](quick_start.md).
+* Have an existing dbt project? [Check out SQLMesh's dbt adapter](./integrations/dbt.md).