chore(templates): add issue templates

.github/ISSUE_TEMPLATE/✨-feature-request.md

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+---
+name: "✨ Feature Request"
+about: Suggest an idea for improving AstroPaper
+title: "[Feature Request]: "
+labels: enhancement
+assignees: ''
+
+---
+
+**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.

.github/ISSUE_TEMPLATE/🐞-bug-report.md

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+---
+name: "\U0001F41E Bug report"
+about: Report a bug or unexpected behavior in AstroPaper
+title: "[BUG]: "
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+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
+
+**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.

.github/ISSUE_TEMPLATE/📝-documentation-improvement.md

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+---
+name: "\U0001F4DD Documentation Improvement"
+about: Propose updates or improvements to the documentation/blog posts
+title: "[Docs]: "
+labels: documentation
+assignees: ''
+
+---
+
+**Describe the Issue**
+A clear and concise description of the documentation issue or improvement.
+
+**Proposed Changes**
+Describe what changes should be made and why they would improve the documentation.
+
+**Additional Context**
+Add any other context or screenshots about the documentation request here.