Resolves document.querySelector not a function when doing SSR with Next.js

[mohsenasfia]

Addresses #2391 and resolves the issue when trying to render lit components with SSR in NextJS where the @lit-labs/ssr/lib/install-global-dom-shim.js is necessary to be imported, but the compilation results in the following error in styled-jsx package:
TypeError .. document.querySelector is not a function
Code sandbox repo which reproduces the issue

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[augustjk]

Thank you for the contribution!

We're taking a stance to keep the DOM shim as minimal as possible. Rather than adding no-op methods to suppress errors, we believe it best for component code to be more intentional about what happens when it does not have access to DOM APIs.

Since this PR and the referenced issue has been opened, we've added node builds that can be safely imported (but not server-rendered) without the global DOM shim, and an isServer environment checker for alleviating errors due to browser code running in the server.