Add docs on environment variables

[AsyncBanana]

Changes

• A new page in the Astro docs was added for environment variables, which closes 📘 DOC: Missing docs on environment variable usages #873.

Testing

None because no core code was changed

Docs

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[matthewp]

Thanks, this is super valuable! However, given that we are hoping to get 0.21 out around the end of the month and that version will use Vite instead of Snowpack, I'm not sure its a good idea to merge in Snowpack-heavy documentation. Would you be open to submitting this against the next branch and rework it to show how to use this will Vite?

[AsyncBanana]

Ok, I have created a new version for Vite in #1587.