Add breadcrumbs to the single Event page (dev)

[bernattorras]

Changes proposed in this Pull Request

• Add breadcrumbs to the single Event page

Testing instructions

• Open a single event page from the Frontend
• Confirm that it has breadcrumbs, linking to the Home, the Events page and mentioning the current event.

Mentions https://github.com/a8cteam51/opensource-net/issues/50