Implement the "Day Off" feature to mark days with no dish assigned

[BowenAnna]

User Story Description
As a manager, I want to be able to mark specific days (e.g., Friday) as "Day Off" with no dish assigned, so that I can create a schedule that accommodates days when no meal is required.

Steps to Follow (optional)

• Step Getting Started: 📜 Review the Chingu Agile Methodology #1
• Step Getting Started: 🤔 Start thinking about project ideas & the technical stack #2
• Additional steps as necessary

Additional Considerations
Any supplemental information including unresolved questions, links to external resources, screenshots, etc.