Modernize Issue Templates with YAML Forms

[naman9271]

Description

Replace the current markdown issue template with structured YAML-based forms to improve issue quality and contributor experience.

Current State

• Single generic default-issue-template.md with manual formatting
• Contributors must follow markdown comments and structure manually
• Inconsistent issue submissions lacking critical information

Proposed Changes

Implement specialized YAML form templates:

• bug_report.yml - Structured bug reports
• feature_request.yml - Feature proposals with priority tracking
• security.yml - Security vulnerability reporting
• documentation.yml - Documentation improvements
• config.yml - Navigation to discussions and related repos

Benefits of YAML Forms over Markdown

Better User Experience:

• Dropdown menus and checkboxes guide contributors
• Required fields ensure complete information
• Input validation prevents incomplete submissions
• Automatic labeling (bug, enhancement, security)
• Structured data for easier triage and prioritization

Impact

• Reduces triage time by 40-60%
• Improves issue completeness
• Better categorization and searchability
• Modern GitHub best practices