Switch to a discussion-first workflow (#1374)

.github/ISSUE_TEMPLATE/1-issue.md

@@ -0,0 +1,16 @@
+---
+name: Issue
+about: Please only raise an issue if you've been advised to do so after discussion. Thanks! 🙏
+---
+
+The starting point for issues should usually be a discussion...
+
+https://github.com/encode/uvicorn/discussions
+
+Possible bugs may be raised as a "Potential Issue" discussion, feature requests may be raised as an "Ideas" discussion. We can then determine if the discussion needs to be escalated into an "Issue" or not.
+
+This will help us ensure that the "Issues" list properly reflects ongoing or needed work on the project.
+
+---
+
+- [ ] Initially raised as discussion #...

.github/ISSUE_TEMPLATE/config.yml

@@ -1,7 +1,11 @@
 # Ref: https://help.github.com/en/github/building-a-strong-community/configuring-issue-templates-for-your-repository#configuring-the-template-chooser
-blank_issues_enabled: true
+blank_issues_enabled: false
 contact_links:
-- name: Question
+- name: Discussions
+  url: https://github.com/encode/uvicorn/discussions
+  about: >
+    The "Discussions" forum is where you want to start. 💖
+- name: Chat
   url: https://gitter.im/encode/community
   about: >
-    Ask a question
+    Our community chat forum.