react-script is broken for node:latest

We learned while building #25 (closed) and #22 that the node:latest docker image is being borky. There are some weird things going on, but I'm not sure which is the cause... here they are:

1. yarn is not creating a node_modules folder when it finishes. It is not failing. It just doesn't make one

• yarn version is the same on my local machine (1.22.22) as the build machine, and it works here
• yarn is not paying attention to its .yarnrc.yml file (could be a new version thing, but I don't think so)

2. react-scripts is called from node_modules and is also horribly deprecated. Could switch to R3F but that is likely not the cause of our issue.