github: Add github issue chooser

Add links to documentation and chat server when a new user opens a new
issue ticket.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Directions
+    url: https://www.klipper3d.org/Contact.html
+    about: Have a question? Need help? Start here.
+  - name: Klipper Chat
+    url: https://discord.klipper3d.org/
+    about: Klipper community Discord chat server.

.github/ISSUE_TEMPLATE/custom.md

@@ -1,2 +1,6 @@
+---
+name: Create a Klipper github issue
+about: Working on improving Klipper? Provide an update on your work here.
+---
 <!-- Do not open this ticket without first following the directions at:
     https://www.klipper3d.org/Contact.html -->