Tests setup relocation

[jeffmaher]

Pull Request Background

Moved test setup steps into the Docker container to enable those steps to be re-used across runs without having to do a reinstall each time the container starts up.

What Changed

• Installation steps moved into the container setup
• package.json: Moved devDependencies into dependencies to enable easier installation and since the only reason the container would be used is for builds/dev (i.e. devDependencies are most useful for when trying to keep an image slim for production, but this container doesn't run the site for prod)
• Removed documentation on running Cypress in Docker, since those steps are build into the setup

How to Check Change

• [ ] Functional and accessibility tests should run as they did before

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