Generate report

[rgreinho]

As a user I must be able to generate reports for a given period of time, with or without graphs.

The 2 first use cases are:

1. Monthly reports
2. Yearly retrospective

The reports are similar, but the user must be able to:

• Select a certain period of time
• Select which graphs to export (or None)
• Generate a PDF

[rgreinho]

This could be a good source of information to start: https://stackoverflow.com/questions/43140467/page-with-multiple-chart-js-charts-to-pdf