New steps in README for M1 macs

[dreeves]

Desiderata

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1. Get this into the README
2. Specifically, put the pip3 stuff for automon in the automon README
3. Discuss whether it can be scripted or something

I believe I had to do the following things on my M1 mac to be able to run bbserver (nee jsbrain_server) locally. Huge thanks to Adam!

1. Install Chromium with Homebrew: brew install chromium (but maybe this would've happened on its own via npm install? I flailed around trying a lot of things and now who knows which things were actually necessary, and, unfortunately, which things I did that I forgot I did)

2. Unquarantine Chromium (also not sure if this was necessary):

$ xattr /Applications/Chromium.app
com.apple.quarantine
$ xattr -r -d com.apple.quarantine /Applications/Chromium.app

3. Set some environment variables (see Puppeteer needs environment variables set #264). This was the final thing that made it suddenly work.

4. Install Python packages for automon with pip3

Cognata

• Puppeteer needs environment variables set #264

Verbata: dev env, apple m1, apple silicon, chromium, environment variables, local dev,