Migrate issue templates to folder-based format

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report an issue with AnnotateRb you've discovered.
+labels: bug
+---
+
+*Please make sure you're running the latest stable AnnotateRb and that the problem hasn't been reported (and potentially fixed) already.*
+
+## Steps to reproduce the problem
+
+This is extremely important! Providing us with a reliable way to reproduce
+the problem will expedite its solution.
+
+## Expected behavior
+
+Describe here how you expected AnnotateRb to behave in this particular situation.
+
+## Actual behavior
+
+Describe here what actually happened.
+Please include any error messages or stack traces.
+
+## Your `.annotaterb.yml` configuration
+
+```yaml
+# Paste your .annotaterb.yml here (if applicable)
+```
+
+## Environment
+
+- AnnotateRb version:
+- Ruby version:
+- Ruby on Rails version:
+- Database adapter (e.g., sqlite3, pg, mysql2):
+- Database adapter version:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest new AnnotateRb features or improvements to existing features.
+labels: enhancement
+---
+
+## Is your feature request related to a problem? Please describe.
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+## Describe alternatives you've considered
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+## Additional context
+
+Add any other context or screenshots about the feature request here.