Move from create-react-app to parcel + babel

[imnasnainaec]

To follow #2875, #2973, #2975, #3054, #3179, #3313
Resolves #2133

When testing this branch, npx jest --clearCache may be necessary if the frontend tests aren't working.

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This change is 

[jasonleenaylor]

This is much less ugly then I was expecting...

Reviewed 6 of 23 files at r1, 1 of 1 files at r2, 22 of 22 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)

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.gitignore line 13 at r3 (raw file):

# Production
build

It wouldn't hurt to leave this during transition - although we should catch any sins in code review.

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jest.config.json line 2 at r3 (raw file):

{
  "collectCoverageFrom": [

If there was anything in here that required extra learning you might want to see if any comments are honored here and add them.

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scripts/jestTransform/babelTransform.js line 1 at r3 (raw file):

"use strict";

A comment explaining the goal and purpose of this transform might help someone in the future. It is in the jestTransform folder, but folder names are too subtle in my experience when trying to understand code.

[imnasnainaec]

Reviewable status: 26 of 29 files reviewed, all discussions resolved (waiting on @jasonleenaylor)

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jest.config.json line 2 at r3 (raw file):

Previously, jasonleenaylor (Jason Naylor) wrote…

If there was anything in here that required extra learning you might want to see if any comments are honored here and add them.

Though our tool chain is not set up to allow comments in JSON files (though I haven't investigated how easily it could be), Jest config specs have a "//" option just for this purpose. And there's docs are quite good on this matter, so I'm not sure what comment is worthwhile here beyond pointing to their docs.

[jasonleenaylor]

Reviewed 3 of 3 files at r4, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)