Improved accessibility & usability enhancements

This update sees a whole load of post-launch clean ups, with some UI improvements and feature enhancements made. Plus, improved accessibility throughout and some bugs squashed.

• Added snack bar system providing the user with subtle feedback on their actions

• Added “Learn more about scheduling” link in collection settings

• Added ‘Set all’ button to change all cards from short answer to true/false question type when generating cards

• Added onboarding tour video after registration to help users get the most out of Luna (can also be accessed via Settings > Support & Legal)

• Improved accessibility across the app (Luna now scores 100% for the accessibility component using Lighthouse, an open-source, automated tool for improving the quality of web pages).

• Improved the review cards process so next card is automatically displayed once the confidence rating is applied

• Improved retake review flow by removing the unnecessary 'Start' screen

• Improved answer cards to allow up to 400 characters

• Improved display of newly added cards by highlighting them in the collection

• Improved UI consistency across the app

• Fixed a bug causing text to be input on an existing collection when updating settings

• Fixed character limit on the name field in the user settings