chore: refine issue templates (#508)

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,6 +1,7 @@
 name: Bug report
 description: File a bug report
 title: '[Bug]: '
+type: Bug
 labels: ['bug']
 
 body:

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Ask a question / Get support
+    url: https://discord.com/invite/khQzPa654B
+    about: Ask questions and discuss with other community members

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,6 +1,7 @@
 name: Feature request
 description: Suggest an idea for this project
 title: '[Feature request]: '
+type: Feature
 labels: ['enhancement']
 
 body: