Event edit basic styling

- Natural language form
- Display choices
Set the title of an event
Choose the date of an event
Choose the time of an event
Hide non-essential event details
modal styling
Issue #47: Improve event editing

As a user I find the event editor confusing. I want something that is
simple and easy to use.

- Set the title of an event
- Choose the date of an event.
- Choose the time of an event
- Set duration instead of manually choosing end time.
- Hide non-essential event details
- Modal styling