Remove the beta release folder and replace with a symlink to the
'latest' release.
Including beta firmware in the APT release causes unecessary churn
and occasionally causes an issue where a user might end up on an
old and unsupported beta release.
Instead, beta releases are will be feature specific and installed
manually via 'rpi-eeprom-config --edit beta-firmware.bin'
i.e. beta releases will be out-of-package custom firmware releases
downloaded from github. The functionality will be merged into
a new latest/stable release or abandoned.
N.B. The old beta releases have been archived to 'old' but are no
longer included in APT.
