Bundle/treeshake sourcecode with Rollup

[natemoo-re]

As a follow-up to #81, I'd like to swap tsc out for a custom rollup build. Inlining dependencies should reduce the install footprint significantly and make everything a lot faster.

If possible, the dependencies should only include snowpack, preact, and the necessary @snowpack/plugin- packages. Everything else should be moved to devDependencies.

[Siilwyn]

Not sure if I should comment here or on #81. Either way this sounds like a good plan! What I don't understand is the size doesn't seem to be decreased in version 1.1.0-next.3...

[natemoo-re]

@Siilwyn Thanks for flagging that, I need to cut another release. If I don't get to it today it'll be tomorrow.

[Siilwyn]

Ah no problem at all!

[natemoo-re]

@Siilwyn 1.1.0-next.4 install size is reduced to 87.0MB. Would love to get that down even smaller, but it's a start.

[Siilwyn]

Awesome! 👏