Update Node and WP versions

[jakejackson1]

Description

WIP to upgrade the JS dependencies.

Testing instructions

Screenshots

Checklist:

• [ ] I've tested the code.
• [ ] My code is easy to read, follow, and understand
• [ ] My code follows the accessibility standards.
• [ ] My code has proper inline documentation / docblocks.

Additional Comments

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.46002% with 99 lines in your changes missing coverage. Please review.

Project coverage is 92.72%. Comparing base (fb70e5c) to head (6b1908f). Report is 7 commits behind head on hot-patch.

Files with missing lines	Patch %	Lines
...s/js/react/components/FontManager/FontListItems.js	87.03%	13 Missing and 1 partial :warning:
src/assets/js/react/reducers/fontManagerReducer.js	89.38%	12 Missing :warning:
...eact/components/FontManager/AddUpdateFontFooter.js	85.48%	9 Missing :warning:
...js/react/components/FontManager/FontManagerBody.js	94.93%	8 Missing :warning:
...ct/components/Template/TemplateHeaderNavigation.js	80.00%	8 Missing :warning:
...ets/js/react/components/FontManager/FontVariant.js	78.12%	7 Missing :warning:
src/assets/js/react/components/ShowMessage.js	80.55%	6 Missing and 1 partial :warning:
...ets/js/react/components/FontManager/FontManager.js	76.19%	4 Missing and 1 partial :warning:
.../js/react/components/Template/TemplateContainer.js	73.68%	4 Missing and 1 partial :warning:
src/assets/js/react/sagas/fontManager.js	92.30%	4 Missing :warning:
... and 12 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## hot-patch #1585 +/- ## ============================================== + Coverage 75.68% 92.72% +17.04% ============================================== Files 251 58 -193 Lines 13612 1526 -12086 Branches 370 420 +50 ============================================== - Hits 10302 1415 -8887 + Misses 3302 103 -3199 Partials 8 8 ```

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[kielllll]

[kielllll]

After the updates, found 25 failed tests on e2e

[jakejackson1]

1. Remove deprecated babel proposal packages (done)
2. Move from standard to wp scripts (WIP)
3. Remove unused api call
4. Update doc blocks
5. Remove React PropType from production build https://github.com/oliviertassinari/babel-plugin-transform-react-remove-prop-types

[jakejackson1]

Issues:

1. superagent to fetch transition: throw exception if ! response.ok
2. AJAX responses: wp_die() cannot set status code if content already output