feat(deck): Replace Website with Forums on Bazzite Portal (#545)

Links to Bazzite's Discourse.

system_files/deck/shared/usr/share/ublue-os/firstboot/yafti.yml

@@ -259,8 +259,8 @@ screens:
       links:
       - "Install More Applications":
           run: /usr/bin/plasma-discover
-      - "Website":
-          run: /usr/bin/xdg-open https://universal-blue.org/images/bazzite/
+      - "Forums":
+          run: /usr/bin/xdg-open https://universal-blue.discourse.group/c/bazzite/5
       - "Join the Discord Community":
           run: /usr/bin/xdg-open https://discord.gg/XjG48C7VHx
       - "Reboot now":