Happy path project never serves traffic

Following the suggestion to use this repo, from the signin redirect page, I cloned and launched (deconflicting the name).

The project never served traffic, and viewing the logs, errored saying

`2023-12-02T22:26:57Z app[5683d496c42468] sjc [info][ 4.310534] reboot: Restarting system error.message="instance refused connection. is your app listening on 0.0.0.0:3000? make sure it is not only listening on 127.0.0.1 (hint: look at your startup logs, servers often print the address they are listening on)" 2023-12-02T22:27:00Z proxy[328744dbee4e85] sjc [error]request.method="GET" request.id="01HGPA7F3Q77TZXQE7NZSY5DDX-sjc"`

Given that this repo offers an intro project it's frustrating that its code conflicts with (newer?) defaults for expected application behavior.

Additionally, the error formatting seems off, like newlines are passed through, or the body comes before the timestamp.