Host all IPFS documentation within one place.

A lot of individual IPFS projects have documentation all over the place, JS-IPFS, and Go-IPFS in particular. This makes it convenient for the devs to create docs but makes it tricky for users that need to access or find those docs in the first place.

Having all IPFS documentation in one place keeps things tidy, consistent, and makes the user experience much better. Instead of having to jump around GitHub repositories and blog posts, readers can head to docs.ipfs.io and get all the information they need.