Update issue templates (#8989)

* Update issue templates

* Update bug_report.md

* Update feature_request.md

* Update support.md

* Update feature_request.md

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,12 +1,27 @@
 ---
 name: Bug Report
-about: Create a report to help us improve
+about: If something isn't working as expected
 
 ---
 
-[Issue text goes here].
+<!-- Make sure that you are submitting a new bug that was not previously reported or already fixed -->
 
-* * * *
+<!-- Please use a concise and distinct title for the issue -->
 
-- [ ] I searched or browsed the repo’s other issues to ensure this is not a duplicate.
-- [ ] This bug happens on a [tagged release](https://github.com/tootsuite/mastodon/releases) and not on `master` (If you're a user, don't worry about this).
+### Expected behaviour
+
+<!-- What should have happened? -->
+
+### Actual behaviour
+
+<!-- What happened? -->
+
+### Steps to reproduce the problem
+
+<!-- What were you trying to do? -->
+
+### Specifications
+
+<!-- What version or commit hash of Mastodon did you find this bug in? -->
+
+<!-- If a front-end issue, what browser and operating systems were you using? -->