Changes:
- feat: Define search folder per newsletter
- feat: Replace Trafilatura with readability and nh3 for improved article parsing
- feat: Custom newsletter slug and email validation
- feat: Add alternate link tag and icon to feeds
- fix: Alembic migration drops table
- fix: Use current time for new entries
- fix: Auto-add decode From header
- fix: Unescape HTML in articles
Full Changelog: v0.4.0...v0.5.0