feat(docs): add developer documentation site (#71) - #378

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11, actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491, golangci/golangci-lint-action@25e2cdc5eb1d7a04fdc45ff538f1a00e960ae128. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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