POC: add icons

Starting point: https://gitlab.com/ui-icons/ui-icons-example/-/tree/main/ui_icons_bootstrap

grimreaper → credited mogtofu33 → .

Automatic usage of icons delayed in ✨ [5.1.x] Use icons Active for 5.1.x version.

grimreaper → credited nicoloye → .

grimreaper → credited g4mbini → .

Automatically closed - issue fixed for 2 weeks with no activity.