* refactor: add components directory
ref #166
* build: split nes.scss into nes.css and nes-core.css
and change npm scripts for build
ref #166
* docs(readme.md): add nes-core.css link
* docs: add components directory path
and minor modification of the document
I've add a script to handle automatically updating bot the CSS and SCSS headers with the relevant
information before publishing. This update is handled as part of `semantic-release`'s preparation
step.
I've moved the SCSS functions file into the `scripts` directory where I think it makes a bit more
sense. I've also abstracted most of the functionality from it so I can also use it in
`semantic-release`'s preparation step.
