feat(welcome) update background
feat(welcome) update background

Use something less dull.

Original: https://unsplash.com/photos/Q1p7bh3SHj8

jitsi/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet