This commit adds support for editing an existing card's title and
description. The (previously named) input modal has been enhanced to
support both creating and editing cards.
Part of apollo/pelican#14
This commit improves the look, feel and functionality of the custom
modal that creates new cards on the board.
Changes:
- (BREAKING) The 'c' key is now used to create new cards.
- An extra field is added for adding the card's description.
- Improvements made to the styling of the modal.
- The fields are reset when the user finishes with the form.