Update Calendar Picker Element in Checkout

[dylanFwhite]

Currently the Date Picker in the Picnic Arrangements section shows the count of items on each day, similar to the Check Availability section. Instead it should just show the unavailable dates grayed out. i.e. Only the non-grey dates are available to be picked.

• Render logic needs to consider all items in the basket (Luxury Picnic / Picnic)
• Need to look into the ability to prevent selecting certain dates

[dylanFwhite]

[dylanFwhite]

Doesn't appear to be the option to prevent selections using the Component props. Instead will have take care of this by adding a check when the onSelect event is fired that only updates the date value if the item selected is a valid choice