Update bbl up instructions for new Macs

[mrosecrance]

Docker image comes from Rajath Agasthya and Nader Ziada.

This adds instructions for bbl to be run from a container as it cannot be run as is from M1/M2 macs

All Submissions:

• [ x] Have you followed the guidelines in our Contributing document?
• [ x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Stories:

• [x ] Have you checked to ensure the new stories don't significantly overlap with other stories in the backlog?
• [ x] Have you applied the appropriate label for the stories?

1. How will the new stories enrich the CF-onboarding curriculum?
2. Brief description of the stories

Updates to Existing Stories:

Proposed Changes

New/Updated Scripts:

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Updates to Docs:

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