add some docs

[mdroidian]

• [x] @mdroidian to double check links and descriptions

generated from https://wiki.mutable.ai/RoamJS/roamjs-components

I pulled in the top level pages, and liked to subsections on that wiki

[mdroidian]

wait was this whole PR auto-generated ??

yeah, all the content from https://wiki.mutable.ai/RoamJS/roamjs-components was auto-generated. 🎉