Why we were down last night.

Server showed as online on the hosting provider dashboard but it wasn't responding. After contacting support, this was fixed at some point.

This led to a config file being reverted because of a setting I didn't change earlier which led to the page only showing "Server error."

Everything should work again and in the future that config file shouldn't change by itself anymore. I still have no idea what the problem on the providers side was, let's hope it doesn't happen again :P