Initialize collections

[hetd54]

We probably want to talk about this more, but I req a review so that you can take a look at the structure.

Question for reviewers: Do we want to allow editing of general page content (like a lede and header image, for example)?

To test locally:

Open a terminal and run

npx @staticcms/proxy-server

In a separate terminal, run

npm run start

Go to http://localhost:4321/admin/index.html

[broarr]

Question for reviewers: Do we want to allow editing of general page content (like a lede and header image, for example)?

That's an interesting question! My initial thought was no, we probably only want admins to edit the text. I think lede can be the first sentence ellipsized. I'm thinking that header images should be static, but I don't hold strong convictions here. @galenwinsor what do you think?

[broarr]

Looks good! How does the i18n work for static cms?

[github-actions]

Visit the preview URL for this PR (updated for commit 12d948f):

https://mmp-site-b1c9b--pr33-cms-collections-u3khwezm.web.app

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[hetd54]

It's easy to add/remove locales at the top of the config file:

Per collection we specify where the locale folders go:

Important: if at the field level i18n is set to true, it MUST be translated before the post can be published. We will need to go back later to set which fields to be translated.