Description

This pull request seeks to update package dependencies to list del as a devDependencies, not as a dependencies.

Additional information

del is only used for Gulp build (build.js and release.js), so it doesn't need to be installed by downstream consumers. By listing del as a devDependencies, this prevents it from being installed during npm install in a consuming project, thus making for a smaller / faster installation. It also helps keep a clearer distinction between dependencies USWDS uses at runtime vs. for development.

Before you hit Submit, make sure you’ve done whichever of these applies to you:

• Follow the 18F Front End Coding Style Guide and Accessibility Guide.
• Run npm test and make sure the tests for the files you have changed have passed.
• Run your code through HTML_CodeSniffer and make sure it’s error free.
• Title your pull request using this format: [Website] - [UI component]: Brief statement describing what this pull request solves.