Remove dependency on Calypso Repository Git Sub-module

1) Remove Unused files. (@c-shultz) ✅

2) Replace Calypso components with WooCommerce components or WordPress components. In none available, copy over the component:

• Button from 'components/button'; (@brezocordero )✅
• Card from 'components/card'; ( @brezocordero ) ) ✅
• CompactCard from 'components/card/compact'; ( @brezocordero ) ) ✅
• Dialog from 'components/dialog'; ( @c-shultz ) ) ✅
• EllipsisMenu from 'components/ellipsis-menu'; ( @waclawjacek ) ✅
• ExternalLink from 'components/external-link'; ( @brezocordero )✅
• FoldableCard from 'components/foldable-card'; (@harriswong ) ✅
• FormButton from 'components/forms/form-button'; ( @harriswong ) https://github.com/Automattic/woocommerce-services/pull/2443
• FormCheckbox from 'components/forms/form-checkbox'; ( @brezocordero ) ✅
• FormCurrencyInput from 'components/forms/form-currency-input'; (@harriswong) https://github.com/Automattic/woocommerce-services/pull/2589
• FormFieldSet from 'components/forms/form-fieldset'; (@bborman22) ✅
• FormLabel from 'components/forms/form-label'; (@bborman22) ✅
• FormLegend from 'components/forms/form-legend'; (@harriswong) https://github.com/Automattic/woocommerce-services/pull/2592
• FormRadio from 'components/forms/form-radio'; (@harriswong) https://github.com/Automattic/woocommerce-services/pull/2595
• FormSectionHeading from 'components/forms/form-section-heading'; (@harriswong) https://github.com/Automattic/woocommerce-services/pull/2596
• FormSelect from 'components/forms/form-select'; (@frosso ) ✅
• FormSettingExplanation from 'components/forms/form-setting-explanation'; (@harriswong) https://github.com/Automattic/woocommerce-services/pull/2600
• FormTextInput from 'components/forms/form-text-input'; (@bborman22) ✅
• FormTextInputWithAffixes from 'components/forms/form-text-input-with-affixes'; (@bborman22) ✅
• FormToggle from 'components/forms/form-toggle'; (@bborman22) ✅
• Notice from 'components/notice'; ( @harriswong ) https://github.com/Automattic/woocommerce-services/pull/2601
• NoticeAction from 'components/notice/notice-action'; (@harriswong) https://github.com/Automattic/woocommerce-services/pull/2601
• PaymentLogo from 'components/payment-logo'; ( @c-shultz ) ✅
• PopoverMenuItem from 'components/popover/menu-item'; (@waclawjacek) https://github.com/Automattic/woocommerce-services/pull/2393
• QueryStoredCards from 'components/data/query-stored-cards'; (@harriswong) https://github.com/Automattic/woocommerce-services/pull/2602
• SimplifiedSegmentedControl from 'components/segmented-control/simplified'; (@harriswong) https://github.com/Automattic/woocommerce-services/pull/2603
• Spinner from 'components/spinner'; ( @ferdev, @harriswong ) https://github.com/Automattic/woocommerce-services/pull/2605
• TokenField from 'components/token-field'; ( @frosso, @harriswong ) https://github.com/Automattic/woocommerce-services/pull/2606
• Tooltip from 'components/tooltip'; ( @ferdev, @superdav42 ) https://github.com/Automattic/woocommerce-services/pull/1930
• format-currency. (@harriswong) https://github.com/Automattic/woocommerce-services/pull/2607/

3) Remove Calypso paths:

• SCSS
• Sass Loader.
• Babel Loader. ( @c-shultz )
• Module resolution.

4) Remove the submodule.

• Done

5) Upgrade the node version.

• Done

6) Remove Calypso references on actively used documentation pages:

• PCYsg-gGj-p2
• PaJDVv-bG-p2

Start with the unchecked items in webpack.config.js, including the SCSS, Sass loader, Babel loader, and module-resolution references. Review package.json and the listed documentation pages, then identify the remaining Calypso components and submodule work. Done means the remaining checklist items are completed, the submodule and Calypso references are removed, and the Node version is upgraded.