Move all the code for defining tag categories from the config file to
TagCategory. It didn't belong in the config because it's not possible to
add new tag categories purely in the config without editing other things
like the CSS.
Also change it so that tag colors are hardcoded in the CSS instead of
generated using ERB. Generating the CSS in ERB meant that the Docker
build had to recompile the CSS on every commit, even when it didn't
change, because it relied on Ruby code outside the CSS that we couldn't
guarantee didn't change.
This directory contains library code used through Danbooru. This includes things like defining API clients, dealing with
sources, parsing tag searches, storing and resizing images, and so on.
Many of the files here use the Service Object pattern. Instead of putting complex code in models or controllers, it goes
here, in plain old Ruby objects (POROs). This keeps models and controllers simpler, and keeps domain logic isolated and
independent from the database and the HTTP request cycle.
587a9d0c8f