A jig is a custom tool used in manufacturing. From Wikipedia
A jig's primary purpose is to provide repeatability, accuracy, and interchangeability in the manufacturing of products.
Software Development != manufacturing of products, but there are still plenty of practices and tools that we can repeat across projects. A webjig is then a small, single use group of code that can be reused across the web in the creation of websites or apps.
This guide is organized by the compiled asset. For example, a Sass webjig would live inside the 'CSS' directory because it will be compiled to CSS. If a webjig is composed of more than one asset type you will find it in the 'Components' directory. This README is also organized by asset type and should contain links to relevant jigs inside the repository.
Pull requests are very welcome. This guide is far from comprehensive and every developer has something new to bring to the table. If you have something you think should be in the guide or found something that needs improvement please open issues and make pull requests.