Create lambda@edge function to rewrite requests and deploy via CDK

[v79]

• Create a new module, nodeJS project
• Add it to the CDK stack
• Update the cantilever distribution to link the function as a viewer request behaviour

[v79]

Took a few attempts but I now have a lambda@edge function in the project and it deploys to us-east-1 region. I've had to explicitly set the region of the main project now, rather than relying on my AWS account's default.

[v79]

I've also moved the content of cantilevers.org into a folder, and copied the rightnotes website content into its own folder too. All is working (except maybe the rightnotes home page, annoyingly).