Revert "Update documentation of Head according to the recent light sensor changes"

This reverts commit 118db6177580ca82bcfc0f000eb6b0bbeecd6276.
Revert "Implement backlight subtraction for LightSensor"

This reverts commit c2cc6d2f4634f09db0963c7a40831992fb440e11.
Revert "Drop floodlight control support"

This reverts commit fbdd2aa90a92f701c1303b7b9d9816217aeb028c.