[FEATURE] Replace react-stickup

[Virtute90]

The react-stickup component does not support react 18 (it is no longer updated since December 2020), it should be replaced with another one.

From a first check it seems that it is only used in the header:

design-react-kit/src/Header/Headers.tsx

Line 3 in 266c46e

import { Sticky, StickyProvider } from 'react-stickup';

[Virtute90]

Ragionando, a cosa serve questo pacchetto? non è sufficiente aggiungere la classe .sticky-top per avere il comportamento desiderato?

FYI @astagi