add text to CONTRIBUTING file to test netlify ignore settings

[jputrino]

Proposed changes

Describe the use case and detail of the change. If this PR addresses an issue on GitHub, make sure to include a link to that issue here in this description (not in the title of the PR).

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• [ ] I have read the CONTRIBUTING doc
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked that all unit tests pass after adding my changes
• [ ] I have updated necessary documentation
• [ ] I have rebased my branch onto main
• [ ] I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[netlify[bot]]

✅ Deploy Preview for mesh-public-docs canceled.

Name	Link
🔨 Latest commit	ff119463212d97f3f8d69a96e9d19b249ab87549
🔍 Latest deploy log	https://app.netlify.com/sites/mesh-public-docs/deploys/644008823261f70008d512ac

[jputrino]

confirmed that netlify cancels build when no changes detected in directories specified in the ignore config. Closing.