Update PR template to remove Issue contents.

Oops, this should have been an issue template. Leaving PR template blank for now.

.github/pull_request_template.md

@@ -1,15 +1 @@
-<h2>Steps to replicate</h2>
 
-[Please include screenshots, browser information, and anything else that can help us recreate the problem.]
-
-<h2>Result</h2>
-
-[What happened.]
-
-<h2>Expected</h2>
-
-[What you expected to happen.]
-
-* User report: [shortlink to chat/forum thread/ticket, ie #12345-hc]
-* Follow-up ticket: [shortlink to ticket, ie #12345-zd]
-* User's site: [link to user's site, including the specific page/post where issue is present]