[FEATURE] Option to disable dictionary radicals

[RicBent]

Generally dictionary radicals aren't really useful for most learners.

An option should be added that allows toggling the radical section.

By default it should be disabled as the difference between primitives and radicals would just throw off beginners.

[saxoncameron]

Hey @RicBent since we've got a couple issues now related to show/hiding sections, what do you think about a new tab in settings for toggling show/hide on any/all sections? We've had a number of requests from users to customise what's displayed, since there's a tonne of info on the cards.

A simple way to implement this would be for me to make a class name apply display: none to the container, then your options could just selectively add class="-hide" to each of the containers.

Then we could just have this the only section that's hidden by default.

[saxoncameron]

Also a note, that however this ends up in the settings panel, we'll need to word it clear enough to explain what it is "Hide dictionary look-up radicals section" or something

[saxoncameron]

Created #57 to separate the discussion/scope for any potential section show/hide.

Let's keep this issue scoped to just the display/hiding of the radicals section, which we can implement now. Can think of whether we want to implement something like #57 down the line.

[RicBent]

Implemented with eb89bd3