Resolve "Redirect after logging in"

Closes #24

See merge request !9

Resolve "Adding appointment"

Closes #40

See merge request !8

appointment in parallel

Resolve "Reminder about sending post mail invitation letter"

Closes #59

See merge request !7

Resolve "IBBL technician view"

Closes #54

See merge request !6

* list is configuarable (start date and end date can be configured)
* view without css for copy to email

Appointments dev

See merge request !5

but appointment existed)

Merge branch 'appointments-dev' of https://git-r3lab.uni.lu/piotr.atyjaszyk/scheduling-system.git into appointments-dev

cancelled

edit subject is available)