Rework a bit the recent work made on RHF example to make some component
more generic, such as RhfSelect and RhfDatepicker, which is based on a
design using RHF context hooks to provide a seamless integration.
Fixes#144
Eslint extension highlighted some issues with the way we were
importing the tsconfig.json file in the .eslintrc.json file.
By changing the extension to .cjs, we are now able to set
tsconfigRootDir to the root of the package thanks to `dirname`.
It helps eslint to find the correct tsconfig.json file.