Replace SUPPORT.yml with link to forum.hestiacp.com

SUPPORT.yml was already broken

Author: jaapmarcus

.github/ISSUE_TEMPLATE/SUPPORT.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+    - name: Support Question
+      url: https://forum.hestiacp.com
+      about: We use GitHub issues only to discuss about HestiaCP bugs and new features.