Design/Implement Interface for Adding/Deleting a Board Stage

[blchelle]

Description

Different projects will have different configurations. So naturally we want to give user the ability to add new stages to their workflow.

This new UI components should be triggered by clicking for the "Add Stage" button in the ProjectBoard page.

For this component, the user should be able to input a string of characters (the name of the stage) and then click a button to add the stage.

This issue does not require back-end logic or redux logic, these will be done in later tickets