Feature Request: Weekday Picker

[ak212]

Is your feature request related to a problem? Please describe.
It would be nice to have an integrated weekday picker in the project.

Describe the solution you'd like
I would like to be able to select day(s) of the week to know what days the user cares about when showing availability results.

Describe alternatives you've considered
There exists an out of date alternative that is based on the react-day-picker project https://github.com/ntdb/react-weekday-picker