upgrade NoN to 2.8.2, explain CLI usage workflow in README, add jimp

[lindsaylevine]

Fixes #74
Fixes #85
Fixes #84

next-on-netlify 2.8.1 now has file tracking per netlify/next-on-netlify#134. this is definitely a bandaid but a decent one to get people using the CLI who want to use it. i updated the README to recommend a workflow for managing the git file tracking until we can come up with a better solution.

[lindsaylevine]

cc @FinnWoelm

[lindsaylevine]

hm. tests failing here in next-on-netlify with this error TypeError: The "path" argument must be of type string:

const cacheDir = findCacheDir({ name: "next-on-netlify", create: true });
const trackingFilePath = join(cacheDir, ".nonfiletracking");

tests pass when i delete the join line. assuming findCacheDir create: true will always output the "created" cacheDir, i'm not sure why it's coming back as undefined. i suppose that assumption is wrong 🤪 .

[lindsaylevine]

i'm guessing this is because of our strange node_modules/test setup in this repo? wonder if there's a workaround without having to update NoN but you probably know best @ehmicky

[ehmicky]

It looks like find-cache-dir can return undefined if either:

• No package.json can be found in cwd or any parent directory
• There is no node_modules directory next to package.json

https://github.com/avajs/find-cache-dir/blob/05a0b0833752b9cd2fe59973688e7f4de2c210a7/index.js#L57