bin

* Add categories and backend groundwork

* Basic categories controller and some fixes

Adds a very basic categories controller (index and show only).
Also adds a bunch of fixes elsewhere in the code to correct bits of
erroneous behaviour and to fix the tests.

* Fix style offenses

* Finish category admin

* Fix rubocop

* Fix seeds script

* Fix tests

* Rename help doc views

* Add fields to category model

* Categories post-create flow

* Categories create-post

* Hotfix for categories/show

* More hotfixes

* Copy hotfixes to homepage

* Yay for hotfixes

* Fix header Meta link

* Fix Rubocop

* Fix tests

* Re-add sort and lottery options

* Fix some more tests

* Love you too, rubocop

* Fix number_to_human issues

* Copy fix to index

* Add error display to questions/edit

* Add logos to repo so they don't keep getting nuked

* Update CD; add category names to title

* Add category tag to hot posts list

* Re-add pagination to categories show

* Ensure community_user is present before transferring content

* Nil check on category tag

* Add category header

* Remove direct Meta links from header and mobile menu

* Use category header button style

* Make an exception for new category

* Activate category if @category is correct

* Try ternary expression instead

* Expand category header on post pages

* Actually fix category header for posts