replace vcal and ical links with up-to-date ICS on events

[sauzher]

https://isaw-migration.jazkarta.com/events/scribe-in-hellenistic-uruk

FWIK, VCAL is deprecated. I propose to generate a ics_view wrapper only, or either make vcs_view a synonym of it

[paregorios]

Agree the we should eliminate VCAL and move forward only with ICS, preferably verified compliant with RFC 5545 and errata/supplements as appropriate.

[skleinfeldt]

@paregorios Would you settle for whatever iCal / ICS Plone gives us, and do the compliance check as part of your testing? If it is not compliant you can make another ticket to either remove it or bring it into compliance.

[paregorios]

@skleinfeldt yes that is a good path forward.

[sauzher]

ok, so there will be only one link (the ical) one. There's no need of a vcal alias, right?

[paregorios]

@sauzher correct