github bug_report: Preamble

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -4,6 +4,13 @@ labels: bug
 title: "[BUG] "
 body:
 
+    - type: markdown
+      attributes:
+        value: |
+            Please make sure to [search issues](https://github.com/mawww/kakoune/issues?q=is%3Aissue) before creating a new one, to avoid duplicates and centralise conversations.
+
+            If you need to have a question about the editor itself (options, behaviour, code…) answered, make sure to check the [documentation](https://github.com/mawww/kakoune/tree/master/doc/pages) (also available via the `doc` command in the editor) or drop by [IRC](https://web.libera.chat/?channels=#kakoune) to get instant feedback.
+
     - type: input
       attributes:
           label: "Version of Kakoune"