Describe celery workaround on Apple Silicon (M1) Macs

[jacobtylerwalls]

brief description of changes

Add a workaround for developers on apple silicon macs to be able to launch celery.

issues addressed

Closes #362

This box must be checked

• [x] the PR branch was originally made from the base branch

This box should be checked

• [ ] after these changes the docs build locally without error
• [x] (no errors in my diff; existing errors exist)

This box should only be checked you intend to follow through on it (we can do it on our end too)

• [ ] I will cherry-pick all commits in this PR into other branches that should have them after this PR is merged

[ekansa]

@jacobtylerwalls Looks good to me. I can't test, as I don't have this hardware, but your update reads clearly.