Add 'Move content' links to the taxons index page
Add 'Move content' links to the taxons index page

Links to 'Move content' were added to the taxons index page to make this
option easier to find.

Trello: https://trello.com/c/vpviEqKv/372-content-tagger-increase-the-prominence-of-the-move-content-link

alphagov/content-tagger,alphagov/content-tagger,alphagov/content-tagger