Update chapters.yaml

[jessesquires]

This updates the chapters info.

We had a listing of these accounts on the newsletter site, but I don't think that makes sense to host there.

• https://github.com/techworkersco/techworkersco.github.io/blob/master/subscribe.md
• rendered here: https://news.techworkerscoalition.org/subscribe/).

I'm planning on removing this from the newsletter site so that we can have a single source of truth to maintain. 😄

• https://github.com/techworkersco/techworkersco.github.io/pull/221