Fix docs site main branch links - #111

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5, actions/dependency-review-action@05fe4576374b728f0c523d6a13d64c25081e0803, step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/