Run an npm audit

[djbowen95]

When I was working on deploying the application, working to resolve issue #11, I reinstalled all dependencies with npm install. When I did this, the command-line flagged that there were 6 'critical' problems with the dependencies, and suggested running audit for details.

To work on this problem I would like to:

• Run npm audit and make note of the changes
• Set up a seperate branch
• Force the suggested fixes
• Manually test the application to check for any breaking changes
• Merge with main / make the changes if there aren't any breaking changes

I'd also like to set up a something that checks these dependencies, ie. a badge that will report these changes, or automate when I need to do this in future.

I don't think this is an immediate task - as it is something to do to expand my knowledge; the application works fine as it is at the moment.

This issue is related to #30.