Don't Include node_modules in project

[richbl]

DOES: Cloning into Electainer brings with it a snapshot of the node_modules directory, as it's currently part of the project. This is pretty significantly heavy and not worth storing in a project.

SHOULD: Instead, the project should exclude the node_modules and require that, after cloning into the project, the developer runs npm install (or npm i) in the project root. As long as package.json is available, the appropriate node packages for the project will be installed at this time.