As a teacher, I want to view my students' study hours over different time increments (day, week, month, year) in a separate menu to see their progress. Assigned to sprint 1.

[maisoonrahman]

• [x] Create table in database to link calendar time to focus time.
• [x] Provide a menu option to access study hour statistics.
• [x] Ensure the statistics are updated in real-time as study hours accumulate.

[caio-a18]

Create challenges pages. Challenges page is not rendering. Profile tab opens up page: (username, level, total study-hours).