use separate md files for sections, notes, etc

[brandonnodnarb]

or we are going to be in merge hell very, very often.

[alpha-beta-soup]

I don't actually think it'll be that bad, if changes are focussed to particular parts.

But you can make a PR to propose some structural change. At this point I think we'll cope with a single classification framework document, but classification systems would be suitable as linked sub-files.

Notes... are up to you. Why do we need notes?

[brandonnodnarb]

I think we've sorted this for the time being.