Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

+---
+name: Bug report
+about: Create a bug report for MinerU
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**How to reproduce the bug**
+- Explain the steps required to reproduce the bug.
+- Include required code snippets, example files, etc.
+- Describe what you expected to happen (if not obvious).
+- If applicable, add screenshots to help explain the problem.
+- Include any other information that could be relevant, for example information about the Python environment.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.