* Add tsvector index on listings
* Fix sorting order when fetching tag flares
* Add published_at as a sorting condition for Homepage::ArticlesQuery
* Re-added param needed by ES, this got lost somewhere down the line
We can't rely on the database returning published articles in ID
order, since there are indexes on published_at and on published which
could very well be in any order (btree), and no explicit `ORDER BY id
ASC` was in the query.
I checked the query that's run in the test against blazer, and confirmed that under
real conditions the results are pretty far from ordered:
```
SELECT articles.id FROM articles WHERE (published_at <= '2021-04-27') AND articles.published = true LIMIT 10 OFFSET 0;
----
id
166916
637099
132444
431420
501939
141182
565391
515964
146231
677241
```
Change the expectation to assert Article does not receive :order, and
remove the expectation that the ids are returned in the order created.
* Re-order test cases to increase tests readability
* Add user_id filter for articles query
* Add organization_id and tags filters
* Add new params to SearchController#feed_content
* Add current_user param so that it can be tested for a small pool of users
