Add a label to the home link in breadcrumbs for accessibility purpose

This issue is about bringing two improvements to the breadcrumbs regarding accessibility:

• (Give the breadcrumb list a label so that screen readers make it easy for the user to understand the role of the list (unless a dedicated HTML role exists or any recommended practice for breadcrumbs).)
• Give the breadcrumbs home icon a label as well, so that it can be understood as a link to the home page, when using a screen reader.

Edit (12/04/23): The first item falls under the https://jira.xwiki.org/browse/XWIKI-20696 ticket. It'll be solved with it. Closing the current issue now only concerns the first item. A change has been made to XWIKI-20696 to highlight this specific issue.