Fix-As a business owner, I want the business statistics visible on the dashboard to reflect real data from the database so that I can be up-to-date on the performance of my business

Acceptance Criteria

• "Total Revenue" on the dashboard should display the real total revenue from all sales in the database.
• "Total Items Sold" on the dashboard should display the real total items sold from all items in the database.
• "Total Customers" on the dashboard should be renamed to "Total Clients", and should display the real total number of clients in the database.

Definition of Ready

• Understood by the team
• Has clear business value
• Is estimated
• Has its dependencies linked
• Is small
• Has its acceptance criteria defined

Definition of Done

• Built and runs without errors
• Is tested against acceptance criteria
• Demoed to the team
• Documented and commented code
• Pages have some basic styling (if appropriate)
• Has at least 70% code coverage for automated testing
• Uses Selenium to full stack test (if appropriate)
• Has no ESLint errors