Add some visual styling to doc series
Update doc count and remove unused templates

There is no index action on the document series controller - the
organisations controller has a document_series action instead. Leaving
reworking this to be more RESTful for the story that will untie series
from organisations.
Improve document series adding feedback

Search results that are already part of the series will be identified
as such. We also update the search results to reflect once a document
has been added. To do this, I've moved the search action out of the
main editions controller. I had hoped to make this a generic search
action, but the mustache template was already tied to document series
management, so it was only a half measure anyway.
Add warning message regarding document series
Search result visual tweaks
Handle non-published editions in search results
FIXUP with main work
TWEAK DOM ids in mustache template
Finish up scenarios