Template a `jsconfig.json`

[d3dc]

We can move to the now pretty standard baseUrl: 'src' most people seem to recommend. Making absolute paths resolve from the source root, removing the need for @ as an alias.

It also gives a more obvious place to expose other aliases like for react-mothership.

[d3dc]

Having collision between a folder called react and the npm package react seems like a "bad idea". I've had success with baseUrl: 'node_modules' - except when doing VSCode refactors.