Update bug_report.md

Remove smartphone and Desktop sections under environments.
Update some styling to match other templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,32 +7,26 @@ assignees: ''
 
 ---
 
-**Describe the bug**
+### Describe the bug
 A clear and concise description of what the bug is.
 
-**To Reproduce**
+## Steps To Reproduce
 Steps to reproduce the behavior:
 1. Go to '...'
 2. Click on '....'
 3. Scroll down to '....'
 4. See error
 
-**Expected behavior**
+### Expected Behaviour
 A clear and concise description of what you expected to happen.
 
-**Screenshots**
+### Screenshots
 If applicable, add screenshots to help explain your problem.
 
-**Desktop (please complete the following information):**
+### Environment
  - OS: [e.g. iOS]
  - Browser [e.g. chrome, safari]
  - Version [e.g. 22]
 
-**Smartphone (please complete the following information):**
- - Device: [e.g. iPhone6]
- - OS: [e.g. iOS8.1]
- - Browser [e.g. stock browser, safari]
- - Version [e.g. 22]
-
-**Additional context**
+### Additional context
 Add any other context about the problem here.