docs: mark project as deprecated
docs: mark project as deprecated

The project lives on in spirit in the form of liferay-npm-tools and
specifically the liferay-npm-scripts package:

https://github.com/liferay/liferay-npm-tools/tree/master/packages/liferay-npm-scripts

natecavanaugh/check-source-formatting,natecavanaugh/check-source-formatting,natecavanaugh/check-source-formatting