Fix the order of interview steps

Technical interviews are before behavioural interviews, at least for backend.

I don't know if this is the case for other positions that have technical interviews, though. So maybe we should just say that these can be in any order?

@sdval @dawsmith @Finotto @timzallmann @lbot @lyle @shaunmccann @tatkins I think you have technical interviews for your teams. Which way round are the steps in those cases?