gh templates: tune bugreport, remove screenshots etc

Author: Joonas Koivunen

.github/ISSUE_TEMPLATE/bug_report.md

@@ -11,21 +11,14 @@ assignees: ''
 A clear and concise description of what the bug is.
 
 **To Reproduce**
-Steps to reproduce the behavior:
-1. Go to '...'
-2. Click on '....'
-3. Scroll down to '....'
-4. See error
+Steps to reproduce the behavior (code) or relevant logs.
 
 **Expected behavior**
 A clear and concise description of what you expected to happen.
 
-**Screenshots**
-If applicable, add screenshots to help explain your problem.
-
-**Desktop (please complete the following information):**
- - OS: [e.g. iOS]
- - Version [e.g. 22]
+**Environment (please complete the following information)**
+- Operating system, kernel version where applicable:
+- Rust version:
 
 **Additional context**
 Add any other context about the problem here.