Redirect to filtered search results after publish

www.agileplannerapp.com/boards/173808/cards/5164

Currently when an editor publishes an edition,
we redirect them back to the editions results
with the filter reset to all published editions.

Following research, editors preferred to go back
to the filtered search results they were last at.
If they had not chosen search filters, we should
redirect them to their organisations published
editions.
Tidy up table of organisations

* Pluralise headings
* Move create organisation action beneath heading
* Make table more legible using borders and table heading styles
* Remove empty nav container
Tidy up heading and table styles for big lists

* Move create actions beneath heading (and warning when there is one)
* Make table more legible using borders and table heading styles —
clearer divide between columns, clearer headers, clearer table
boundaries
* Remove empty nav container
High profile groups display on organisation index
Merge pull request #1699 from alphagov/redirect-to-filtered-view-on-publish

Redirect to filtered search results after publish
Merge pull request #1702 from alphagov/table-cleanup

Tidy up heading and table styles for big lists
Merge pull request #1705 from alphagov/add-high-profile-groups-to-org-index

High profile groups display on organisation index
Script to move content from one topic to another

This is part of https://www.pivotaltracker.com/story/show/76471962

All editions tagged with the source topic are retagged replacing the
source topic with the destination topic.

I decided to apply this to all editions including old ones since this
script is expected to be used when doing bulk re-assignment of topics;
we'll be likely to delete the source topic using the existing
specialist_sector_cleanup task after running this, so any old editions
where we didn't re-assign the topic would just lose their topic.