Refactor the Frontend: Move Items into Components

[dmth]

Currently there is a lot of Code-Duplication going on.

A good practise is to refactor the application and move frequently used Elements into Components. Such components are (for example):

Infoboxes

• [ ] "Recently Sent" Ticket
• [x] "Tickets today"
• [x] "Events today"

Search - Forms

• [ ] "Query Events"
• [ ] "Query Tickets"

List views

• [ ] "List of Events"

This should happen both visual (the visible component) and functional (the code that is querying the Backend).