Feature: Rollup changelog

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At Colalb Summit, @ljharb and I discussed better ways to showcase notable changes between versions.
We envision a user feature that could aggregate the notable changelog entries from X version to Y version, helping users better understand new things.

This could also be an opportunity to surface any relevant @nodejs/userland-migrations or perhaps EOL content options.

该 issue 未指明任何文件、测试或入口点。首先定位 Node.js 网站现有的 changelog 内容以及拟议的 X-to-Y 版本聚合，然后审查如何呈现 userland-migrations 和 EOL 内容。完成标准尚未定义，需要为该功能确立这些标准。