Add standardized Github Issue Templates

[ayushsri-dev]

Description

This PR adds standardized GitHub Classic Markdown Issue Templates and supporting documentation to streamline issue reporting, maintainer triage, and GSSoC 2026 contributor assignment workflows across the repository.

Summary of Changes:

1. GitHub Issue Templates (.github/ISSUE_TEMPLATE/):

   • bug_report.md — Structured bug reporting template with reproduction steps, error logs, and environment details.
   • feature_request.md — Feature proposal template with problem statement, technical details, and acceptance criteria.
   • documentation.md — Documentation improvement proposal template.
   • ui_ux_improvement.md — UI styling, responsiveness, dark mode, and accessibility enhancement template.
   • enhancement.md — Code refactoring, TypeScript typing, and DX tooling template.

2. Issue Helper Config (.github/ISSUE_TEMPLATE/config.yml):

   • Configures issue chooser links pointing to the GSSoC 2026 Discussion thread (🧡 GSSoC 2026: Read this before contributing #120) and Community Q&A.

3. Template Directory Index (.github/ISSUE_TEMPLATE/README.md):

   • Quick reference table listing all templates, filenames, purposes, and default labels.

4. Updated Guidelines (CONTRIBUTING.md):

   • Updated bug reporting and feature request sections to link directly to GitHub's issue template chooser and docs/ISSUE_TEMPLATES.md.

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Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🔧 Configuration change
• ♻️ Refactoring (no functional changes)
• 🎨 Style/UI changes

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Related Issues

Fixes #441

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Screenshots (if applicable)

N/A — Non-UI workflow configuration and documentation changes.

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Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code where necessary
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have tested my changes locally
• Any dependent changes have been merged and published

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Additional Notes

All templates strictly utilize GitHub Classic Markdown (.md) format with pre-populated editor text areas to maintain frictionless DX, offline portability, and consistency with .github/PULL_REQUEST_TEMPLATE.md.

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