Developer tooling: one-command setup, docs from main, and the fork URLs - #15

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: Zomzog/changelog-checker@v1.2.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/