Update all (non-dev) dependencies

[tomByrer]

This combines updating core-js & better buble, & updates all other dependencies (but not devDependencies). buble-jsx-only is a fork that has been battle tested in 11k repos via MDX.

Tests work, lint does not from pre-existing errors..

jest
 PASS  src\utils\test\errorBoundary.test.js
 PASS  src\utils\test\transpile.test.js

Test Suites: 2 passed, 2 total
Tests:       13 passed, 13 total
Snapshots:   0 total
Time:        2.421s
Ran all test suites.

Thanks for your time :)

[tomByrer]

Looking at the new built file sizes, the updates somehow made the /dist folder grow over 10x.

[tomByrer]

This version is OK, adds only a few bytes, tests are fine.

[NateRadebaugh]

Deploy failed

failed during stage 'building site': Deploy directory 'demo/out' does not exist

[tomByrer]

Deploy failed

@NateRadebaugh Thanks for looking. Only 2 files I touched was package.json (& nothing related to builds) & src/utils/transpile/transform.js , so I'm not sure how the deployment system got mangled?