Powered-up perf gate (python version)

• make sure you have python and pip installed (tested with python 3.9 and up)
• install requirements (pip install -r requirements.txt)
• if you're using browser mode, you need selenium and a chrome driver depending on your current browser version
  • download the driver from the provided link depending on your chrome version
  • copy it next to the script and make sure it's executable (chmod +x) and not blocked by filevault on MacOS
• if you're using lighthouse mode, install Node 16 then use npm it to install lighthouse CLI
  • npm install -g lighthouse