Be more specific with licensing

[richard-uk1]

This feels slightly off to me; in particular, what counts as code? Like, is it content in code blocks - what happens if someone moves some content between code blocks and not in a code block?

I think the simplest solution might be to just dual-license everything as both/either CC-BY and Apache, unless anyone else has a better suggestion. Whatever the final scheme is, we should probably describe it in a README of this repo.

-- @DJMcNab (Copied from comment in #10)