Talk URL template is hard-coded

[pbock]

The URLs to talk description pages are currently based on a hard-coded template (https://fahrplan.events.ccc.de/congress/2016/Fahrplan/events/${id}.html) which works only for 33c3 but would have to be changed manually for future events.

There's no easy solution to this because the Fahrplan lists neither URLs to the individual talk pages nor a URL template.

The least annyoing solution is probably to create a configuration file that maps congress identifiers to URL templates. This still requires maintenance, but it's a bit more obvious than burying it somewhere deep in the template.