Update yarn references in docs and package.json

Author: NullVoxPopuli

README.md

@@ -15,12 +15,6 @@
 
 ### 1. Install plugin
 
-```shell
-yarn add --dev eslint-plugin-ember
-```
-
-Or
-
 ```shell
 npm install --save-dev eslint-plugin-ember
 ```
@@ -354,10 +348,10 @@ If you have any suggestions, ideas, or problems, feel free to [create an issue](
   - `lib/rules/new-rule.js` (implementation, see [no-proxies](lib/rules/no-proxies.js) for an example)
   - `docs/rules/new-rule.md` (documentation, start from the template -- [raw](https://raw.githubusercontent.com/ember-cli/eslint-plugin-ember/master/docs/rules/_TEMPLATE_.md), [rendered](docs/rules/_TEMPLATE_.md))
   - `tests/lib/rules/new-rule.js` (tests, see [no-proxies](tests/lib/rules/no-proxies.js) for an example)
-- Run `yarn update` to automatically update the README and other files (and re-run this if you change the rule name or description)
+- Run `pnpm update` to automatically update the README and other files (and re-run this if you change the rule name or description)
 - Make sure your changes will pass [CI](./.github/workflows/ci.yml) by running:
-  - `yarn test`
-  - `yarn lint` (`yarn lint:js --fix` can fix many errors)
+  - `pnpm test`
+  - `pnpm lint` (`pnpm lint:js --fix` can fix many errors)
 - Create a PR and link the created issue in the description
 
 Note that new rules should not immediately be added to the [recommended](./lib/recommended-rules.js) configuration, as we only consider such breaking changes during major version updates.

RELEASE.md

@@ -8,4 +8,4 @@
 
 4. `export EDITOR="vim"` to choose an editor for editing the changelog
 
-5. `yarn release` (uses [@release-it-plugins/lerna-changelog](https://github.com/release-it-plugins/lerna-changelog) to handle versioning, the changelog, publishing to GitHub and NPM, etc)
+5. `pnpm release` (uses [@release-it-plugins/lerna-changelog](https://github.com/release-it-plugins/lerna-changelog) to handle versioning, the changelog, publishing to GitHub and NPM, etc)

package.json

@@ -51,7 +51,7 @@
     "lint:package-json-sorting:fix": "sort-package-json package.json",
     "lint:remote": "eslint-remote-tester",
     "release": "release-it",
-    "start": "yarn run test:watch",
+    "start": "pnpm test:watch",
     "test": "jest",
     "test:coverage": "jest --coverage",
     "test:watch": "jest --watchAll",
@@ -133,10 +133,7 @@
   "engines": {
     "node": "18.* || 20.* || >= 21"
   },
-  "volta": {
-    "node": "21.5.0",
-    "yarn": "1.22.21"
-  },
+  "packageManager": "[email protected]",
   "publishConfig": {
     "registry": "https://registry.npmjs.org"
   },