[#48243391] Fold history of multiple editions

Provide a JS accordion to minimise/expand edition comments to make
reading the history of a specific artefact with multiple editions
easier to understand and consume.
Wrap accordion UI elements in the Twitter Bootstrap style

This provides a little arrow showing the UI affordance.

Also using slideToggle(), over slideUp() and slideDown() to reduce
some of the login in our JS files.
Set id to be #edition-history so it's more specific

Having this set to #accordion before wasn't portable.