Page with schedules for all academic groups (like in spreadsheets)

[ArtemSBulgakov]

Describe the feature

Sometimes a student wants to see all classes in university for today. It would be convenient to create a page where all academic groups classes are shown on one calendar.

Suggested solution

Request all .ics files for academic groups and display schedule for one week (maybe smth like dayGridWeek view) in many columns (like in Google Spreadsheets).

Additional context

See comments.

[ArtemSBulgakov]

Perhaps, it should look like in Google Spreadsheets.

[ArtemSBulgakov]

Relates to #101, #123