fix: reduce size, fix signin redirect

* correct freegames url
* skip downloading browsers in docker
* remove fluxbox
* remove stdout for vnc & xvfb

docker/vnc-start.sh

@@ -1,9 +1,5 @@
 #!/bin/sh
 
-# Disable fbsetbg and start fluxbox in a background process:
-mkdir -p ~/.fluxbox && echo 'background: unset' >>~/.fluxbox/overlay
-fluxbox -display "$DISPLAY" &
-
 # Start VNC in a background process:
 x11vnc -display "$DISPLAY" -forever -shared -rfbport "${VNC_PORT:-5900}" \
     -passwd "${VNC_PASSWORD:-secret}" &