Extract Jest, Prettier, commitlint, Husky... configuration from package.json

[tkrotoff]

Make them independent .js files with @ts-check (or .ts files if easily possible):

• jest.config.js
• jest.setup.ts
• babel.config.js
• .browserslistrc
• prettier.config.js
• .prettierignore
• .huskyrc.js
• commitlint.config.js
• tslint.json
• .eslintrc.js
• ...

• This way you don't a fatty package.json that does multiple unrelated things
• You can add comments in .js files
• You can check the .js files with TypeScript and/or a linter
• One file does one thing, ala UNIX philosophy

Downside is that you have multiple root files, well that's how JavaScript development is nowadays.