* add edit links to events on dashboard
* fit elements on screen for mobile
* initialize components for consistent text styles
* add more fine grained width/height settings
* add higher level setting for when an event is available
- db: add supporting values to period allow setting an amount of days,
a range, or unlimited number days an event is available
* fix issue where periodDates are null
* return minimal required data, handle date parsing
* [ui] limit booking days based on user period settings
* api: validate user period settings
* [db] migration for event type period settings
* More tests to be added to verify slots logic
* Adds Jest
* Implements logic to the booking code to take into account grayed days
* Slots take workhours into account
TODO: Improve the tests, evaluate the structure, small re-orgs here and
there for improved readability / better code
Alex van Andel