Import documentation from ipfs/js-ipfs into this repo.

[johnnymatthews]

The JS-IPFS project has a bunch of documentation that the team handles. To make docs.ipfs.io the single source of truth for all IPFS documentation, we'll collect all the docs from around the JS-IPFS ecosystem and merge them into this project.

[jessicaschilling]

Suggest we prioritize this; we saw a large number of links in docs broken when content in the js-ipfs repo was rearranged recently.

[johnnymatthews]

I can take a look at this today while I'm waiting for the 0.5 RC.

[johnnymatthews]

Tasks

Find a way to automate this process:

1. Grab files here: https://github.com/ipfs/js-ipfs/tree/master/docs/core-api
2. Throw into here: https://docs.ipfs.io/reference/js/api/