feat: version support page

pages/about/versioning.md

@@ -0,0 +1,40 @@
+---
+title: Version Support
+---
+
+# Version Support
+
+webpack follows a **current + maintenance** support model:
+
+- **Current** — The latest major release line. Receives new features, bug fixes, and security fixes.
+- **Maintenance** — The single major release line immediately preceding the current one. Receives bug fixes and security fixes only. A version enters maintenance as soon as the next major version is released.
+- **End-of-Life (EOL)** — Everything older than the maintenance line. When a new major version is released, the version previously in maintenance becomes EOL.
+
+## Support Table
+
+| Major Version                                                 | Minimum Node.js Version | Release Date  | Status          | EOL Date      |
+| ------------------------------------------------------------- | ----------------------- | ------------- | --------------- | ------------- |
+| [**v5.x**](https://github.com/webpack/webpack)                | v10.13.0                | October 2020  | **Current**     | —             |
+| [**v4.x**](https://github.com/webpack/webpack/tree/webpack-4) | v6.11.5                 | February 2018 | **Maintenance** | —             |
+| **v3.x**                                                      | v4.3.0                  | June 2017     | EOL             | February 2018 |
+| **v2.x**                                                      | v4.3.0                  | January 2017  | EOL             | June 2017     |
+| **v1.x**                                                      | v0.6.0                  | February 2014 | EOL             | January 2017  |
+
+A version in **Maintenance** remains there until the next major version of webpack is released, at which point it becomes EOL and the outgoing Current version takes its place. For example, when webpack 6 is released, v5.x will move to Maintenance and v4.x will reach EOL.
+
+## EOL Policy
+
+EOL versions of webpack are unsupported. The webpack team does **not** plan to address, patch, or release fixes for any issues found in EOL versions — including security vulnerabilities.
+
+In rare circumstances, at its sole discretion, the team _may_ choose to backport a fix for a critical security vulnerability to an EOL version. This is an exception, not a policy: **do not rely on it, and do not plan around or for it.** If you are running an EOL version, the only supported remediation for any issue is upgrading to a supported release line or rely on third-party commercial support providers.
+
+Issues and pull requests filed against EOL versions will be closed.
+
+## Release Schedule
+
+webpack does not publish release timelines. There is **no ETA** for:
+
+- The release date of any future major version (including webpack 6), or
+- The date on which the current version will transition to Maintenance.
+
+Rather, major versions ship when they are ready.

pages/site.mjs

@@ -14,6 +14,7 @@ export const sidebar = {
       items: [
         { link: '/about/branding', label: 'Branding' },
         { link: '/about/sponsors', label: 'Sponsors' },
+        { link: '/about/versioning', label: 'Version Support' },
         {
           link: 'https://github.com/webpack/webpack/blob/main/CONTRIBUTING.md',
           label: 'Contribute',