Work on the calendar component.

[CharanMN7]

• Check the latest calendar component from shadcn.
• Compare it with the one we have in this repo to standardize the styling and find better way(s) to extend it without losing accessibility.
• Split the current calendar component to be more modular or make different calendar components, each for different purposes.

[CharanMN7]

Refer to #6 for more details about the component