Update guidelines and link to submit a case study

Author: KimMcMahon

content/en/docs/contribute/new-content/blogs-case-studies.md

@@ -50,11 +50,10 @@ real-world problems. The Kubernetes marketing team and members of the {{< glossa
 Have a look at the source for the
 [existing case studies](https://github.com/kubernetes/website/tree/master/content/en/case-studies).
 
-Use the [Kubernetes case study submission form](https://www.cncf.io/people/end-user-community/)
-to submit your proposal.
+Refer to the [case study guidelines](https://github.com/cncf/foundation/blob/master/case-study-guidelines.md) and submit your request as outlined in the guidelines. 
 
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