workflow: update issue template

Author: ulivz

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,11 +7,18 @@ about: Create a report to help us improve
 <!-- Please don't delete this template or we'll close your issue -->
 <!-- Before creating an issue please make sure you are using the latest version of VuePress. -->
 
-## Bug report
+<!-- Please confirm you will submit an issue. -->
+<!-- Issues which contain questions or support requests will be closed. -->
+<!-- (Update "[ ]" to "[x]" to check a box) -->
+
+- [ ] I confirm that this is a issue rather than a question.
 
-<!-- Please ask questions on StackOverflow. -->
+<!-- Please ask questions via following several ways. -->
+<!-- https://vue-land.js.org/ -->
+<!-- https://forum.vuejs.org/ -->
 <!-- https://stackoverflow.com/questions/ask?tags=vuepress -->
-<!-- Issues which contain questions or support requests will be closed. -->
+
+## Bug report
 
 #### Version