Run the versions I specify in the course

You need to run the versions I specify in the course to follow along with the course. When you run `npm install`, you will receive warnings. You can ignore the warnings. It will run fine. To switch to the versions I specify in the course, do this:

1. Delete node_modules
2. Copy the dependencies and devDependencies from [the package.json that I provide in the course](https://gist.github.com/coryhouse/29bd1029b623beb4c7f79b748dcba844)
3. Run this to install dependencies: `npm install`
4. Once you complete the course, I show how to update to the latest versions [here](https://github.com/coryhouse/javascript-development-environment/pull/7).

Start by comparing the course's dependency and devDependency instructions with the package.json referenced in the issue. Update the relevant course-facing guidance so readers can install the specified versions and understand that warnings may be ignored; confirm the instructions still match the linked update guidance.

Written by the indexing model from the issue text.