Fix: wrong path when clicking "suggest event" on website

When navigating on the StudyGroup website, Events, https://uio-carpentry.github.io/studyGroup/#portfolio the button to "Suggest Event" has a wrong path leading to here http://mozillascience.github.io/studyGroupHandbook/event-types.html instead of the Issues on the repo.

This needs fixing.

Find out where to change the link. Then change it.