chore: add issue template config + PR template (remix-run#1896)

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,12 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Get Help
+    url: https://github.com/remix-run/remix/discussions/new?category=q-a
+    about:
+      If you can't get something to work the way you expect, open a question in
+      the Remix discussions.
+  - name: Feature Request
+    url: https://github.com/remix-run/remix/discussions/new?category=ideas
+    about:
+      We appreciate you taking the time to improve Remix with your ideas, but we
+      use the Discussions for this instead of the issues tab 🙂.

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,15 @@
+<!--
+
+👋 Hey, thanks for your interest in contributing to Remix!
+
+**Please ask first before starting work on any significant new features.**
+
+It's never a fun experience to have your pull request declined after investing a
+lot of time and effort into a new feature. To avoid this from happening, we
+request that contributors create a
+[Feature Request discussion](https://github.com/remix-run/remix/discussions/new?category=ideas)
+to first discuss any significant new features.
+
+https://github.com/remix-run/remix/blob/main/CONTRIBUTING.md
+
+-->