Update configurations and folder structure

[alexasselin008]

Summary

• Updated configurations to the new packages
• Simplified babel configs hierarchy in planification of replacing the need for Babel
• Updated folder structure to something more familiar

What I did

Package.json, tsconfig.json and Dependencies

• Removed @sharegate/browserslist-config-recommended and browserlist configs
• Replaced @sharegate/eslint-config-react, @sharegate/eslint-config-recommended and @sharegate/eslint-config-typescript by @sharegate/eslint-plugin
• Replaced @sharegate/stylelint-config-recommended by @sharegate/stylelint-config
• Changed .eslintrc so it supports linting mdx file properly
• Moved some .eslintrc rules to the top eslint file
• merged eslint, eslint:pkg, eslint:sb into a single command
• merged stylelint, stylelint:pkg, stylelint:sb into a single command
• Added @sharegate/typescript-config and removed the need for tsconfig.shared.json files
• Renamed check-types command to typecheck

Folder structure

• Removed all babel.config.js files except the one at the root.
• Moved typescript extra typings to a @types folder
• Created a tooling folder, intended for tools that could be extracted in pkgs
  • Moved typescript utils functions to tooling/typescript-utils
  • Moved jest-utils to tooling/jest-utils
• Moved jest.config.ts and setup-jest.js files at the root folder
• Moved the svgr-mock file to the __mock__ folder

Node version

• Updated node version for circle ci from 16.5 to 16.10 to match dependencies expectations

Whats coming next

• Rename storybook folder to .storybook
• Replace babel with tsc

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