Docs on How to Upgrade

[zachleat]

Surfaced here 11ty/eleventy#361 (comment) by @kleinfreund

[kleinfreund]

@zachleat I’d much rather have a few short lines in the actual readme document in the repository. That’s just sometimes the page people (including me) end up on. For example, I often navigate to pages by entering a string like ele into the address bar and let my browser suggest me the page I most often visit. For ele, that’s https://github.com/11ty/eleventy.

So I’d like to see something like this in the readme:

Installation & update

npm install -g @11ty/eleventy

---

Basically, the starting lines of the Getting Started document.

[zachleat]

Upgrade helper shipped here https://www.11ty.dev/docs/plugins/upgrade-help/