Add developer docs (second tutorial?) explaining how to use the taxonomy, annotate a dataset, etc.

[NevilleS]

Right now there's a big chunk of developer documentation missing, which should cover:

• why the dataset resource exists
• how to create a dataset to represent your database schema
• why the data categories taxonomy exists
• how the data categories taxonomy is structured
• how to annotate your dataset with data categories
• etc.

[ThomasLaPiana]

it sounds like generally we just need a better resources page, all of this stuff should be clear after reading that page

@brentonmallen1 made the great observation that just reading the resources page doesn't tell you much about why any of that stuff matters or how to use it, just how to define it

[NevilleS]

I discussed a plan for documentation updates with @cilliankieran and @iamkelllly this morning; we've got several docs planned that should cover this and more. Assigning this issue to @iamkelllly as she's working with a writer on a more detailed walkthrough/tutorial.

[NevilleS]

@iamkelllly was #145 intended to close this one?

[iamkelllly]

Yes, thank you!