Revert "Make "more info" sections accessible, using <details> tag"

This reverts commit 672cc1c12ff40afcbd0e176e1c8e93d0f6b9eaa6.

    Conflicts:
	  app/common/templates/module.html
	  spec/shared/common/views/spec.module.js

After some discussion around the interaction pattern, we've decided to revert
this for now and improve the accessibility when we do more work on page-per-thing
in a few weeks time.