Upgrade the calendar for employees section

The current Employees calendar is less user friendly for users and employees. This needs to be upgraded to new design with scheduler calendar with the design below [here](https://imgur.com/a/8TUFRfz).

Explore the [big calendar](https://reactjsexample.com/an-events-gcal-outlook-like-calendar-component-built-for-react/) for more details.