refactor(CContainer): remove unused breakpoint prop

Author: mrholek

src/components/grid/CContainer.tsx

@@ -3,7 +3,6 @@ import PropTypes from 'prop-types'
 import classNames from 'classnames'
 
 export interface CContainerProps extends HTMLAttributes<HTMLDivElement> {
-  breakpoint?: 'sm' | 'md' | 'lg' | 'xl' | 'xxl'
   /**
    * A string of all className you want applied to the base component. [docs]
    */