Right, I think you refer to the script heat_map_google.py ? I forget to withdraw it from github, it is an old one. Sorry !
Everything is in the folder fitbit_modules now. Do you want to run the code on your computer locally, or just use the app ? Because I created a better version since I wrote this article. You can find it on this link:
You just have to create a Strava account to use it.
If you do, can you tell me what could be improved ? Thank you !