Rethink `--keywords`

[koaning]

The keywords mechanic is cool, but it does suck to have to reload the server. It still seems to fine to be able to pass keywords in the beginning, but is does seem more user-friendly to be able to change them on the fly in the interface. Possibly, we might even allow for regex stuff.

[koaning]

It'd also be nice if --keywords would allow for a patterns.jsonl file from Prodigy. The label would define the color, but the patterns would be able to match many terms. It's preferable to use something like this when working with terms/phrases.

For example: let's say that I want to find the color cluster. In that case you'd like to start with a list to generate one cluster with color terms. Not have each color term be drawn with another color. Same goes for brands, names, etc.