Broken links in add-ical-url

[frereit]

When I am visiting a URL like http://localhost:8088/#/ctf/1/info and then click on the tasks tab, then I get an empty screen and the following warning in the console:

The URL that has the empty page is http://localhost:8088/#/ctf/1-Midnight-Sun-CTF-2022-Quals/tasks in my case. So this is probably due to the slug being added again to the URL.

Originally posted by @JJ-8 in #146 (comment)

[frereit]

(wrong org, my bad ^^)