misc: remove checkboxes from bug report template (#5330)

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -1,30 +1,25 @@
 ---
 name: Bug report
-about: File an issue ticket to help us improve
+about: Report something working incorrectly
 
 ---
 
 <!-- Before creating an issue please make sure you are using the latest version and have checked for duplicate issues. -->
 
-# Bug report
+## Bug report
 
-**Provide the steps to reproduce.**
+#### Provide the steps to reproduce
 1. Run LH on <affected url>
 
-**What is the current behavior?**
+#### What is the current behavior?
 
-**What is the expected behavior?**
+#### What is the expected behavior?
 
 
-**Environment Information**:
-Affected Channels:
-- [ ] CLI
-- [ ] Node Module
-- [ ] Extension
-- [ ] DevTools
-
-Lighthouse version:
-Node.js version:
-Operating System:
+#### Environment Information
+* Affected Channels: <!-- CLI, Node, Extension, DevTools -->
+* Lighthouse version:
+* Node.js version:
+* Operating System:
 
 **Related issues**