Bug fixes and enhancements

What's Changed

• color coding for answers by @shraddha in #500
• The previous version quiz is fixed as per current display logic by @shraddha in #540
• Error toast will be shown while bug reporting by @shraddha in #548
• The issue of incorrect experiment ratings on the list-of-experiments page has been fixed

New Contributors

• @shraddha made their first contribution in #500

Full Changelog: v2.0.0...v2.1.0