Hi Teo,
Jade is server side tech, and it reads the.jade file and compiles that into html that's send off to the browser.
Angular is running on the browser, and does not know how to handle .jade.
My guess is that (I don't know your server stack!) that you need to include tutorial.html, to make your server preprocess your .jade file.
(Disclaimer: never used Jade in my life!)
Regards
Sander