[cherry-pick] Remove email support (#7249)

Remove email support (#7247)

Co-authored-by: Daniel <[email protected]>

site/content/troubleshooting/troubleshoot-support.md

@@ -36,5 +36,3 @@ Visit the [project’s GitHub repository](https://github.com/nginxinc/nginx-supp
 - If you have any enhancement requests, please [open a feature request](https://github.com/nginx/kubernetes-ingress/issues/new?assignees=&labels=proposal&projects=&template=feature_request.md&title=) in GitHub.
 
 - If you have any ideas or suggestions to discuss, please [open an idea discussion](https://github.com/nginx/kubernetes-ingress/discussions/categories/ideas) in GitHub.
-
-- You can contact us directly, by sending an email to [[email protected]](mailto:[email protected]).