📝 Adding elestio as managed-hosting option (#914)

apps/docs/self-hosting/managed-hosting.mdx

@@ -30,6 +30,12 @@ Cloudron sponsors this project on Github.
  />
 </a>
 
+### [Elestio](https://elest.io/)
+
+Elestio shares it's revenue with this project.
+
+[![Deploy](https://pub-da36157c854648669813f3f76c526c2b.r2.dev/deploy-on-elestio-black.png)](https://elest.io/open-source/rallly)
+
 ---
 
 If you have a provider you'd like to recommend, please [open an issue](https://github.com/lukevella/rallly/issues/new) on Github.