Two fields on config endpoint

Could we expand the config endpoint https://sleepingpill.javazone.no/public/config

Two new fields:

1) conferenceID (guid for the active conference)
2) conferenceWeb - e.g. https://2019.javazone.no/ or https://2020.javazone.no/ (I could work this from the date - but if its a config then we're not locked in to URLs of YEAR.javazone.no)

Start by tracing the /public/config endpoint in the sleepingPillCore repository and inspect how its current response is assembled. Add conferenceID and conferenceWeb to that response, using the requested active-conference identifier and configurable website URL, then verify the endpoint returns both fields.

Written by the indexing model from the issue text.