Volunteers: Add Discord URL

Author: NMertsch

src/content/pages/volunteers.mdx

@@ -24,7 +24,7 @@ We will also have a small number of perks for you, some small gifts to say "than
 * 😎 Get an awesome EuroPython Volunteer T-shirt that you can keep and show off to your friends
 * ♾️ A mention on the website to stay there forever
 * 🤝 Be part of a great team and make new friends
-* 📸 A special group photo with all volunteers (time will be announced in the *#onsite-volunteers* channel on Discord)
+* 📸 A special group photo with all volunteers (time will be announced in the *#volunteers-lounge* channel on [Discord](/discord))
 * 🎉 And a big applause during the closing session of the conference
 
 ## What Volunteering at EuroPython looks like