chore(ci): setup netlify for simpler previews and remove circle ci

[lwasser]

closes #816 This PR sets up Netlify in favor of CircleCI, which is clunky. It should also build only the languages that are currently published in the guide.

[netlify]

✅ Deploy Preview for python-package-guide ready!

Name	Link
🔨 Latest commit	30dc56b
🔍 Latest deploy log	https://app.netlify.com/projects/python-package-guide/deploys/6ac8016e6cf0b00008b1a391
😎 Deploy Preview	https://deploy-preview-817--python-package-guide.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
🤖 Make changes	Run an agent on this branch

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[lwasser]

I will turn off circle ci once i see the preview here works. it's taking a while.

[lwasser]

Ok this is ready for review!! i deleted circle ci config and project settings.

[InessaPawson]

@lwasser Two admin items outside this PR (but related):

• remove CIRCLECI_TOKEN from repo secrets
• confirm no secrets are set as site-level env vars in the Netlify UI (see my comment #817 (comment))

[lwasser]

@InessaPawson I didn't set up any envt variables in Netlify or on GitHub for this to work that I know of. Do you know where to find that setting in Netlify? I don't see anything there in the setup . Circle CI tokens i can definitely delete. that's easy!!

[lwasser]

OK, CircleCI is deleted HERE, but we will need to delete it for other repos where I stripped CircleCI in favor of Netlify. The projects tho are deleted in CircleCI as well, so that helps.

[InessaPawson]

@InessaPawson I didn't set up any envt variables in Netlify or on GitHub for this to work that I know of. Do you know where to find that setting in Netlify?

@lwasser On the PyOS Netlify dashboard, check:

Project configuration - Environment variables
Team settings - Environment variables

If both are empty, we are good.

[lwasser]

cool ok yes, both of those are empty. I never set anything up on Netlify. I think we are good to go here.

I deleted the CircleCI token, but we also have an organization-wide one that some projects used. I don't want to delete that token until we are sure no other repos depend on CircleCI.

But I've been deleting CircleCI projects as I remove the config and move the project to Netlify. Netlify authenticates via an app, so that makes things simple, and each time I add a new repo to Netlify to build, I just add that repo's permissions to Netlify!