* Recast key docs to be much clearer and more accurate [skip ci]
Also, fix a couple broken hash links I noticed while making this.
* Ensure `diff` blocks are highlighted correctly
- Lot of people couldn't migrate to v1 and plan to reevaluate when v2 is
released.
- It's "npm" not "NPM". It doesn't stand for anything, and it never
has - it was initially chosen simply because it was easy to type.
It has a lot of unofficial backronyms with "Node Package Manager"
being one of the most common ones, but it's never officially stood
for anything as an acronym *or* initialism.
- Fixed a few errors in the change log, like non-breaking changes being
included in the "Breaking Changes" section and an inaccuracy in the
summary of a particular change.
- Fixed RawGit URLs to point to GitHack, which is a lighter proxy that
offloads caching to Cloudflare instead of also implementing it itself.
(It also just uses nginx for all the important server logic, so it
scales better.)
- Add a few more v0.2 references as appropriate
