feat: blog improvements

[felangel]

Status

READY

Description

• refactor: blog to use content collections
• feat: incorporate a collection schema which validates the frontmatter
• refactor: frontmatter date format
• feat: include cover image in frontmatter
• feat: include author in frontmatter
• feat: improve blog card style
• feat: improve blog content style

Type of Change

• [X] ✨ New feature (non-breaking change which adds functionality)
• [ ] 🛠️ Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 Code refactor
• [ ] ✅ Build configuration change
• [ ] 📝 Documentation
• [ ] 🗑️ Chore