upgrade Jitsi DEC 2021

upgrading to jitsi-meet/stable 2.0.6726-1 from #132

prepared custom.css separation #169 (closed)

applied fixes for all.css #169 (closed)

apt log: luajwtjitsi 2.0-0 is now installed in /usr/local

after upgrade asks always for authentification also with fairmeeting.net or run.fairmeeting.net, on pro.fairmeeting.net even for joining users

JWT works for pro