feat: create ES5 output for IE11 compatibility.

[pseudoramble]

To address #520. May not be the only IE11 issue to resolve, but it at least gets it to load without syntax issues.

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[simenandre]

AFAIK, this should be fine to merge. I'm curious, does this change the bundle size?

[pseudoramble]

I assume it will because it most like requires more code to do ES5 support. I don't have specific numbers though. Let me get them for you and I'll report back.

[simenandre]

I added bundlewatch and tested it here; ended up with 3.98KB. I think that is fine 🤷‍♂️