Modify ordering for issue templates. (#569)

Number the templates to obtain the desired order.

.github/ISSUE_TEMPLATE/03-question.yml

@@ -0,0 +1,9 @@
+name: 'Question'
+description: Ask a question.
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/04-blank.yml

@@ -1,5 +1,5 @@
 name: 'Blank Issue'
-description: Ask a question or discuss a topic not already covered by the other issue types.
+description: Discuss a topic not already covered by the other issue types.
 body:
   - type: textarea
     id: description

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,2 @@
+blank_issues_enabled: false
+