create-rpi-oslist: improve based on upstream feedback

Based on feedback received at https://github.com/raspberrypi/rpi-imager/issues/250 this commit ensures we provide a link to detailed image information for each entry.

Once this is merged and deployed, the following commands must be executed on aura:

create-rpi-oslist v2021.1
create-rpi-oslist v2022dev2.0