feat(front): possible to generate and view report

Made the report page use the /generate_report and /report endpoints. Showing the report nicely formatted.

To test this, submit some reflections on a unit, then click "view report" on that unit and see the report being generated. If you want to test if further, you can submit more reflections from another user and see the red indicator indicating that there are new reflections since last generated report.

Closes #69 (closed)