Is this Repo have one page

[Anujmoglix]

This Repo is cloned properly but does it have many page or single . I am getting

ERROR Error: Uncaught (in promise): Error: Cannot match any routes. URL Segment: 'lessons'
Error: Cannot match any routes. URL Segment: 'lessons'
on clicking Lessons .

Could not subscribe to notifications Error: Service workers are disabled or not supported by this browser