Expose LISTEN_PORT in baseConfig + various print fixes
- use new headless mode. You onla need to install chrome with this and can omit chrome-headless-shell
- expose browser logs if LOG_LEVEL is "debug". They will have a scope: "puppeteer-print" field in them, so they can be searched for
- expose LISTEN_PORT in baseConfig so print can use it to connect to the correct server in dev mode