Update _index.md

The marathon project has been archived on Oct 23, 2024, hence their Github pages deployment is not active. The reference can be updated to point to their Github repo instead.

Author: anveshreddy18

content/en/docs/concepts/workloads/pods/_index.md

@@ -408,6 +408,6 @@ To understand the context for why Kubernetes wraps a common Pod API in other res
 
 * [Aurora](https://aurora.apache.org/documentation/latest/reference/configuration/#job-schema)
 * [Borg](https://research.google.com/pubs/pub43438.html)
-* [Marathon](https://mesosphere.github.io/marathon/docs/rest-api.html)
+* [Marathon](https://github.com/d2iq-archive/marathon)
 * [Omega](https://research.google/pubs/pub41684/)
 * [Tupperware](https://engineering.fb.com/data-center-engineering/tupperware/).