chore: specify package manager version in package.json

[hichemfantar]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

Include the packageManager field in package.json to specify the version of Yarn used for the project.
Corepack will use the specified version to ensure consistency across environments.
https://nodejs.org/api/corepack.html

Test Plan

Test links

Deploy preview: https://deploy-preview-10807--docusaurus-2.netlify.app/

Related issues/PRs

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[slorber]

Thanks 👍

I thought I tried this in the past and it was annoying me when not having corepack enabled, but can't reproduce anymore so it must be a mistake I made

[hichemfantar]

if you currently use corepack, it's probably good for you to know that it looks like there are plans to stop bundling it with node and make it separately installable

nodejs/package-maintenance#606