Change build process and core development kit

[Renaud009]

Since react-redux-starter-kit is deprecated and new technologies and libraries arrived in the last 3 years, it is suggested that we change our main configuration and development core set. Also note that koa server will no longer be needed and build will have to simply focus on creating optimized and static bundle.

To avoid configuration nigthmare composing multiple tehcnologies together, it is suggested that we change for a common starting kit with a large community. Those criterias should be also met:

• No extra-dependencies that we won't be using
• HMR, Dev server, eslint and other basic dev tools
• UglifyJS, Webpack and other basic build tools
• PWA and service worker built-in
• Redux support and dev tools config
• CLI scaffolder (or simply re-use redux-cli blueprints)
• Babel ES8+ and/or typings (Flow?)
• Unit tests with Jest ideally, code coverage, etc.

Consider adding

• SSR/Universal JS (optional)
• React Native (optional++)

[Renaud009]

@Zvax Any other criteria can be suggested and will be considered :)