Jobs fixes

This adds a new Interactive Developer job and removes the JS Engineer role, but also fixes a few bugs, namely the devblog vanishing due to CAPI v2 switch, and system JS being updated (at least, when I ran it locally) and all the file references failing.
I don't want to derail poor @mattandrews PR any further but I've been wondering if we should have an companion app to the static site that contacts the third parties and serves stale to the client-side avoiding the issue.