Simplify issue template

The current issue template is way too verbose when opening a new issue, and by default it doesn't get rendered so the markdown is useless. Simplify it so it's readable.

Author: shana

ISSUE_TEMPLATE.md

@@ -1,13 +1,6 @@
-Thank you for contributing! Before you submit this issue please check that you have:
-- [ ] Read the ["Submitting an Issue"](https://github.com/github/VisualStudio/blob/master/CONTRIBUTING.md#submitting-an-issue) section of the Contributor Guidelines
+Hello! Please read the guidelines at https://github.com/github/VisualStudio/blob/master/CONTRIBUTING.md#submitting-an-issue before submitting an issue.
 
-### Version of the GitHub Extension
-The version of the extension is at `Tools\Extensions\Installed - GitHub Extension for Visual Studio`
+- GitHub Extension version:
+- Visual Studio version:
 
-### Version of Visual Studio
-The version of VS is on the `Help\About`, on the top left, above the copyright line.
-
-### What happened
-Tell us what went wrong
-
-### Steps to reproduce
+### What happened (with steps, logs and screenshots, if possible)