Update link to example usage of docker builder by Oak Project

[thompson-shaun]

docs: update link to Oak Project workflow file

Summary

Update link to example workflow usage by Oak Project in README.md

Testing Process

Visually verified change and followed updated link

Checklist

• Review the contributing guidelines
• Add a reference to related issues in the PR description.
• Update documentation if applicable.
• Add unit tests if applicable.
• Add changes to the CHANGELOG if applicable.

[ianlewis]

mnist_eval.yaml seems to not exist and I think Project Oak no longer uses our workflow. Was it perhaps removed recently?

[thompson-shaun]

I'm at a loss 😅
Want me to remove the section?

[ianlewis]

I'm at a loss 😅 Want me to remove the section?

Yeah, I'm not sure we need it anymore. Thanks!