Adds a blog section (#5784)

**What's the problem this PR addresses?**

In preparation for the 4.0 release, this diff adds a blog section to the
website, port the old article, and amorce the writing of the 4.0 release
post.

Fixes #5817
Fixes #5818

Author: arcanis

.pnp.cjs

@@ -0,0 +1,23 @@
+releases:
+  "@yarnpkg/cli": patch
+  "@yarnpkg/plugin-workspace-tools": patch
+
+declined:
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-essentials"
+  - "@yarnpkg/plugin-init"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-nm"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-pack"
+  - "@yarnpkg/plugin-patch"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/plugin-pnpm"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/builder"
+  - "@yarnpkg/core"
+  - "@yarnpkg/doctor"

.yarn/cache/@docusaurus-core-npm-2.4.1-1ba8a4e422-4a3707cfae.zip renamed to .yarn/cache/@docusaurus-core-npm-2.4.3-08a77367ca-56df20cfd1.zip

@@ -8,9 +8,11 @@ Yarn now accepts sponsors! Please take a look at our [OpenCollective](https://op
 Features in `master` can be tried out by running `yarn set version from sources` in your project.
 :::
 
+## 4.0.0
+
 ### **Major Changes**
 
-- With Node.js 16's End of Life [approaching fast](https://nodejs.org/en/blog/announcements/nodejs16-eol), we dropped support for Node.js versions lower than 18.12.
+- With Node.js 16's [now being End of Life'd](https://nodejs.org/en/blog/announcements/nodejs16-eol), we dropped support for Node.js versions lower than 18.12.
 
 - Some important defaults have changed:
   - `yarn set version` will prefer using `packageManager` rather than `yarnPath` when possible.

.yarn/cache/@docusaurus-cssnano-preset-npm-2.4.1-21d487b1e8-d498345981.zip renamed to .yarn/cache/@docusaurus-cssnano-preset-npm-2.4.3-87aadb769f-f4a4c60b07.zip

@@ -100,6 +100,7 @@
     "node": ">=18.12.0"
   },
   "dependencies": {
+    "@iarna/toml": "^2.2.5",
     "@mdx-js/react": "^1.6.22",
     "@yarnpkg/types": "workspace:^",
     "chalk": "^3.0.0",