Add 16 operator reference pages and a Relational and Boolean category - #14

Unhandled error: HttpError: Resource not accessible by integration

Process completed with exit code 3.

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4, actions/github-script@v7, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Summary report available at: https://github.com/claricle/postscript-guide/actions/runs/39944832115#summary-120384805261