Format issue templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -4,19 +4,22 @@ about: Create a bug report to help us improve
 title: ''
 labels: bug
 assignees: ''
-
 ---
 
-**Description**
+# Description
+
 A clear description of what the bug is.
 
-**Instructions to reproduce the bug**
+# Instructions to reproduce the bug
+
 A clear explanation of how to reproduce the bug.
 
-**Environment information:**
- - Lean version: [e.g., 4.26.0 or N/A]
- - Rocq version: [e.g., 9.0.0 or N/A]
- - OS: [e.g., macOS Tahoe 26.4]
+# Environment information:
+
+- Lean version: [e.g., 4.26.0 or N/A]
+- Rocq version: [e.g., 9.0.0 or N/A]
+- OS: [e.g., macOS Tahoe 26.4]
+
+# Additional context
 
-**Additional context**
 Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -4,14 +4,16 @@ about: Suggest an idea for a new feature
 title: ''
 labels: enhancement
 assignees: ''
-
 ---
 
-**Description**
+# Description
+
 A clear description of what you want to happen.
 
-**Alternatives considered**
+# Alternatives considered
+
 A clear description of any alternative solutions or features you've considered.
 
-**Additional context**
+# Additional context
+
 Add any other context about the feature request here.