Revert "Merge pull request #19 from alphagov/instrument-user-journey"

Throws exceptions on preview (probably asset pipeline
not set up).

This reverts commit 6dc3e0090139ba93124a500c5fc65c9bf8db8bca, reversing
changes made to a0925a54b0dd1c194fdf7d85a917a9fb5a80c52c.