Disable Dates from DatePicker

Hi Farid,

Each individual calendar cell can be customized, by providing custom logic inside to the `Cell` component, through the `cell` property of the Calendar. The `isDisabled` property can be passed to some cells to disable their selection and provide a visual clue of the current cell state. Please take a look at the following example:
https://www.telerik.com/kendo-react-ui/components/dateinputs/calendar/custom-rendering/#toc-overriding-the-default-properties

Once the Calendar has been customized according to your requirements, simply pass the customized calendar to the DatePicker, through the `calendar` property of the DatePicker.
For more examples of how the Calendar of the DatePicker can be configured, please refer to the following article:
https://www.telerik.com/kendo-react-ui/components/dateinputs/datepicker/custom-rendering/#toc-customizing-the-calendar

Regards,
Kiril
Progress Telerik