Update issue template (#7938)

* Update issue template

* Delete old issue template

.github/ISSUE_TEMPLATE/default-issue-template.md

@@ -0,0 +1,30 @@
+---
+name: Default issue template
+about: Use this template for all issues
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Description
+
+Please provide a brief description of the issue.
+
+## Version
+
+Please provide your Lighthouse and Rust version. Are you building from
+`stable` or `unstable`, which commit?
+
+## Present Behaviour
+
+Describe the present behaviour of the application, with regards to this
+issue.
+
+## Expected Behaviour
+
+How _should_ the application behave?
+
+## Steps to resolve
+
+Please describe the steps required to resolve this issue, if known.