Date Picker docs needs update

[sethhorsley]

https://www.rubyui.com/docs/date_picker

if there are no components listed then do not show the install command since there are no components to install.

We should update it to be more like:
https://ui.shadcn.com/docs/components/base/date-picker

With the example on how to make a date picker with the calandar component.