Installable PWA w/ simple server management plugin

[acao]

In the interest of playground parity, this would be an installable, auto-updating replacement for the electron build

Because we deploy the webpack example build with netlify again, we can just go ahead and make it an installable PWA

Demo:

https://deploy-preview-3380--graphiql-test.netlify.app/webpack

click "install" in the URL bar on chrome

Additional Features

• simple example SelectServer plugin that allows you to provide a graphql server, saves previously requested URLs and shows schema state
• working copy as cURL using the code-exporter plugin

[changeset-bot]

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Latest commit: dfe0247

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[netlify]

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[github-actions]

The latest changes of this PR are not available as canary, since there are no linked changesets for this PR.

[TallTed]

minor human-facing fixes