Update issue templates

relates to kairos-io/kairos#1483

Author: mauromorales

.github/ISSUE_TEMPLATE/file-issues-on-main-kairos-repo.md

@@ -0,0 +1,12 @@
+---
+name: File issues on main Kairos repo
+about: Tell users to file their issues on the main Kairos repo
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+:warning: All Kairos issues are tracked in our main repo, please file your issue there, thanks! :warning:
+
+https://github.com/kairos-io/kairos/issues