Next version based on Bootstrap Italia 2

[Fupete]

[IT] Sono partite le lavorazioni per l'aggiornamento del kit React a Bootstrap Italia 2 (basato su Bootstrap 5).
Il branch main contiene i lavori in corso e un piano preliminare delle attività.
Commenti e contributi di tutta la community sono più che necessari! 🎉

[EN] Work has begun to update the React Kit to Bootstrap Italia 2 (based on Bootstrap 5).
Branch main contains the work in progress, and a preliminary plan of activities.
Comments and contributions from the whole community are more than necessary! 🎉

Things to do

• Create branch next from master (will become main in the next major release) and deprecate master to 4.x.
• Force the update (on the next branch) of all the dependencies, including Bootstrap Italia 2 and the latest React Strap, both based on Bootstrap 5.
• Add a label next to issues.
• Verify, and update CI and GitHub Actions.
• Start opening, if needed, dedicated issues for next branch. For each components we will have to:
  • Verify and update, markup and classes of the resulting DOM template, compared to Bootstrap Italia 2
  • Check the rendering of the component (CSS application including spacing, dimensions, typography, ...), compared to Bootstrap Italia and the new UI kit
  • Check the behavior of the component (JavaScript, user interaction, states, keyboard interaction for accessibility, ...), compared to Bootstrap Italia 2
  • Verify the accessibility of the component, including automatic tests and manual evaluations by a11y experts, if possible
  • Evaluate the need to supplement the component storybook documentation with more detailed information.