doc: remove ABI guide

[gabrielschulhof]

Move it to the nodejs.org repo.

Checklist

• documentation is changed or added
• commit message follows commit guidelines

[nodejs-github-bot]

@gabrielschulhof build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/1147/pipeline

[gabrielschulhof]

nodejs/nodejs.org#1828

[vsemozhetbyt]

Node.js Collaborators, please, add 👍 here if you approve fast-tracking.

[gabrielschulhof]

CI: https://ci.nodejs.org/job/node-test-pull-request/17672/

[gabrielschulhof]

Landed in fd6a7d4.

[Trott]

Theoretically, this shouldn't have landed quite yet because the second 👍 was not from a Collaborator on the core repo. But that's OK, I'm going to add a post-facto 👍 right now! 😆

[Trott]

Theoretically, this shouldn't have landed quite yet because the second 👍 was not from a Collaborator on the core repo. But that's OK, I'm going to add a post-facto 👍 right now! 😆

(This would be a possible argument for either eliminating wait times altogether or else automating more. I know there's been talk about having ncu check fast-track approvals but I'm not sure what obstacles might exist. OK, I'll stop rambling...)

[gabrielschulhof]

@Trott Thanks! Maybe we should edit into the request to 👍 instead of reacting to it with an emoji:

Add your 👍 here to fast-track:<👍s go here>