Remove Colibri variables

[SlavikCA]

Colibri is removed:
jitsi/docker-jitsi-meet#2285

This page still shows variables for Colibri:

https://jitsi.github.io/handbook/docs/devops-guide/devops-guide-docker/

• COLIBRI_WEBSOCKET_JVB_LOOKUP_NAME
• COLIBRI_WEBSOCKET_REGEX
• ENABLE_COLIBRI_WEBSOCKET_UNSAFE_REGEX
• DISABLE_COLIBRI_WEBSOCKET_JVB_LOOKUP
• JVB_COLIBRI_PORT
• COLIBRI_REST_ENABLED

also, the Reverse proxy configuration section has colibri

should be removed?