Configure webpack's require

[roman-holovin]

Set root of the project to be able to require files relative to that directory. It is needed because since things will move around a lot because project file structure is not settled yet. Such change will allow to make changes faster, since fewer path changes will be need to move modules around.

Also jsx extension should be added to the list of default ones to be able to omit it when importing modules.

[roman-holovin]

25m