Remove count of all members and office bearers when viewing NCOPs.

Closes #1517
Swap home page quote to use an info page with slug "homepage-quote"
Merge branch '1521-editable-homepage-quote'
Merge branch '1517-remove-ncop-people-counts'
The <a ...> link should be closed with </a> not </foo> (sigh)

This was generating malformed HTML which was being corrected by browsers
in such a way that extra <a ...> links were being inserted into the DOM
in unexpected places, such as that mentioned in #1510.

Thanks to Chris Mytton for his help in figuring this out and spotting
the errant </foo>.
Move hide-reveals.js into core
When indexing SayIt speeches in Elasticsearch, include any tags
Make sure info pages and blog posts are indexed in Elasticsearch

This also includes blog posts, which are a kind of info page.
Rewrite Pombola's search, and unify multiple search pages

This makes the following changes to search in Pombola:

* There's no longer a separate PU (Polling Unit) search for Nigeria -
  you can just put a PU number into the normal search box.

* Remove the separate Hansard search page for Kenya.

* Adds a set of 'Advanced Search' options that let you restrict you
  search to a particular type of result, and control ordering of
  results.

* Add a "Top Hits" section of the search results to highlight
  (by default) people and blog post matches.

* For South Africa, you can restrict your search results to just
  Questions, Hansard or Committees.
Add styling for the rewritten search interface
Factor out the pagination
Separate out search templates from generic list item templates

(Includes two fixes from Chris Mytton - many thanks.)
made search results displays more consistent
search results with images now display nicely
search results with thumbnails now display nicely on mobiles
Style pagination, remove inactive buttons
Improve the "order by" position and add better results feedback

Chris Mytton did the implementation to wire up the results feedback.
Link to speeches in context in search results

Rather than just linking to the speech page, link to the whole
section that the speech is in.
Add published date to blog posts in search results

This includes SCSS by Martin Wright
Move ordering dropdown back into advanced form

This needs to be inside the advanced form so that when the form is
submitted the new ordering is picked up.

This includes SCSS by Martin Wright.