Update all-contributors configuration to avoid merge conflicts

[zeke]

When adding a new contributor to the project using @all-contributors please add @user for docs, the user's name is appended to the end of the contributors array in the .all-contributorsrc file. This is problematic because two separate PRs will likely conflict, as they are both modifying the same part of the file.

We may be able to work around this using the contributorsSortAlphabetically option, which appears to be supported by both the CLI and the GitHub bot:

• https://allcontributors.org/docs/en/bot/configuration
• https://allcontributors.org/docs/en/cli/configuration

cc @github/docs-engineering @janiceilene

[JasonEtco]

Makes sense to me. The unintended change here would be that the core maintainers of the project aren't listed first like we are now, but I think that's okay.

[zeke]

☝🏼 Yeah I was thinking that. Maybe there's a hybrid way to approach this, where the source JSON data in .all-contributorsrc is alphabetized, but the avatars in the README retain their chronological order. I don't think that's supported out of the box, though. 🤔

[janiceilene]

The readme's are the easier spot to end up with yaml mistakes when resolving conflicts. The JSON doesn't ever require any real updates. Honestly, it's annoying and unfortunate, but mostly not a real problem 🙃

[nschonni]

Might be worth adding an auto-land action for those PRs from their bot. They the conflicts are less likely crop up then as well

[janiceilene]

We're removing all-contributors for now 😞 Our small team just can't keep up with the (amazing!) influx of contributions. There's more details available in #576 (review) and this issue should definitely stay open so we can figure out how to resolve this complexity and get something back up and running 🙌

[nschonni]

Probably makes sense to close the open PRs https://github.com/github/docs/pulls/app%2Fallcontributors

[nschonni]

There are also some leftover branches in https://github.com/github/docs/branches/all

[chiedo]

No longer using all-contributors.