v4.2.0 - More stats

• 🚚 Issue #222: Switch from Bulma CSS framework to Bootstrap.
  • Add tooltips.
  • Add calendar filter on Downloaded, Uploaded, and Statistics views.
• 🚚 Move from Python tabulate to rich.table.
• ✨ Add a few columns in Download and Torrent models to allow more stats.
• ✨ Issue #192: Better statistics page with more information.
• ♻️ Rework flash message implementation to handle toast notifications.
• 🐛 Fix minor bug fixes and UI issues.
• 📝 Update documentation.