chore(docs): add Railway template one-click deployment to quickstart section

Author: leggetter

docs/pages/overview.mdx

@@ -35,6 +35,7 @@ Follow the quickstart and run Outpost with either RabbitMQ or SQS via LocalStack
 
 Try the Outpost quickstarts:
 
+- [Railway template one-click deployment](/docs/quickstarts/railway)
 - [Docker with RabbitMQ or AWS SQS via LocalStack](/docs/quickstarts/docker)
 - [Kubernetes with RabbitMQ](/docs/quickstarts/kubernetes)