Feature: work with C3VOC / CCC to import the history of their events

[laf0rge]

The German Chaos Computer Club is organizing tech conferences for more than 30 years, and the last decades of video recordings (5108 videos from 135 events) are available from https://media.ccc.de/

As both the C3VOC data as well as the codeandtalk.com data is available in machine-parsable, structured data, it should be possible to write some kind of converter to import the data here.

See also: https://github.com/voc/voctoweb/issues/307