feat: add ssr support

[zeroedin]

EXPIREMENTAL PR - DO NOT MERGE

Attempt using labs/eleventy-plugin-lit to provide SSR support mentioned in #70

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Latest commit: 15da2ab

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[zeroedin]

Initial issue: MutationObserver not defined in context provider after configuration.

Might be an known issue? Reference: lit/lit#2490

Unexpected error while rendering lit component in worker thread ReferenceError [Error]: MutationObserver is not defined
    at new ColorContextProvider (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@rhds/elements/lib/context/color/provider.js:25:48)
    at file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@rhds/elements/lib/context/color/provider.js:119:32
    at file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@lit/reactive-element/node/reactive-element.js:6:2438
    at Array.forEach (<anonymous>)
    at RhCard.u (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@lit/reactive-element/node/reactive-element.js:6:2426)
    at new p (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@lit/reactive-element/node/reactive-element.js:6:731)
    at new s (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/lit-element/lit-element.js:6:54)
    at new RhCard (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@rhds/elements/elements/rh-card/rh-card.js:35:9)
    at new LitElementRenderer (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@lit-labs/ssr/lib/lit-element-renderer.js:18:24)
    at getElementRenderer (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@lit-labs/ssr/lib/element-renderer.js:20:20)
[11ty] Uncaught exception: (more in DEBUG output)
[11ty] MutationObserver is not defined (via ReferenceError)
[11ty] 
[11ty] Original error stack trace: ReferenceError: MutationObserver is not defined
[11ty]     at new ColorContextProvider (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@rhds/elements/lib/context/color/provider.js:25:48)
[11ty]     at file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@rhds/elements/lib/context/color/provider.js:119:32
[11ty]     at file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@lit/reactive-element/node/reactive-element.js:6:2438
[11ty]     at Array.forEach (<anonymous>)
[11ty]     at RhCard.u (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@lit/reactive-element/node/reactive-element.js:6:2426)
[11ty]     at new p (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@lit/reactive-element/node/reactive-element.js:6:731)
[11ty]     at new s (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/lit-element/lit-element.js:6:54)
[11ty]     at new RhCard (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@rhds/elements/elements/rh-card/rh-card.js:35:9)
[11ty]     at new LitElementRenderer (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@lit-labs/ssr/lib/lit-element-renderer.js:18:24)
[11ty]     at getElementRenderer (file:///Users/sps/Sites/_brand/red-hat-brand/node_modules/@lit-labs/ssr/lib/element-renderer.js:20:20)

I might be missing something from the configuration, will poke at this more later.