docs: remove obsolete wiki reference (fixes #584)

Author: jeboehm

.github/ISSUE_TEMPLATE/bug_report.md

@@ -6,10 +6,6 @@ labels: ""
 assignees: ""
 ---
 
-☺️ Please check the troubleshooting page before opening a new issue. ☺️
-
-https://github.com/jeboehm/docker-mailserver/wiki/Troubleshooting
-
 **Describe the bug**
 A clear and concise description of what the bug is.
 
@@ -24,8 +20,13 @@ If applicable, add screenshots to help explain your problem.
 
 **Docker environment (please complete the following information):**
 
+- Output of `docker ps -a` (filter relevant containers)
 - Output of `docker info`
 - Output of `docker-compose version`
 
+**Kubernetes environment (please complete the following information):**
+
+- Output of `kubectl get pods -o wide`
+
 **Additional context**
 Add any other context about the problem here.