update yarn, update readme.md on corepack

.yarnrc.yml

@@ -1,3 +1,3 @@
 nodeLinker: node-modules
 
-yarnPath: .yarn/releases/yarn-4.0.1.cjs
+yarnPath: .yarn/releases/yarn-4.4.1.cjs

README.md

@@ -16,6 +16,17 @@ Web application for Pendulum. This project was bootstrapped with [vite](https://
 
 In the project directory, you can run:
 
+### Install yarn - corepack
+
+Enable Corepack by executing the command `corepack enable`. Corepack is included by default in Node.js, it manages the
+Yarn version specified in the `packageManager` field.
+
+**Important:** Modern [Yarn](https://yarnpkg.com/getting-started/install) releases should not be installed globally or
+via npm - use Corepack instead.
+
+**Note:** If you are using Volta to manage your Node.js versions, you need to follow the
+instructions [here](https://yarnpkg.com/corepack#volta).
+
 ### `yarn install`
 
 Install dependencies

package.json

@@ -3,7 +3,7 @@
   "private": true,
   "version": "1.5.4",
   "type": "module",
-  "packageManager": "yarn@4.0.1",
+  "packageManager": "yarn@4.4.1",
   "scripts": {
     "dev": "vite",
     "build": "node version.cjs && tsc && vite build && echo '/* /index.html 200' | cat > dist/_redirects",