feat: Include link to Bazzite's FAQ documentation... (#446)

...at the end of the Bazzite Portal.

NOTE: If this takes up too much real estate and forces the "reboot now" option to be hidden or anything then DNM or revert!

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

@@ -246,6 +246,8 @@ screens:
           run: /usr/bin/plasma-discover
       - "Website":
           run: /usr/bin/xdg-open https://ublue.it
+      - "Bazzite FAQ":
+          run: /usr/bin/xdg-open https://universal-blue.org/images/bazzite/FAQ/
       - "Join the Discord Community":
           run: /usr/bin/xdg-open https://discord.gg/XjG48C7VHx
       - "Reboot now":