Add Editor 'Save' Prompt to Avoid Losing Changes

[okjuan]

Description:
Ask the user if they would like to save changes before leaving the editor. #ForgivingDesign

Requires:

• Logic in Editor component based on value of dirtyBit state field.
• A friendly prompt.

Breakdown:

• Add logic in Editor.jsx to prompt if dirtyBit === true i.e. there exist unsaved changes
• Design and implement prompt
• Test

Time Estimation:
2 hrs.