Component that lists all days

[bonndan]

As a user I want to see an overview of all days and their status when visiting the root (/) url of the running Spring Boot application.

• create a route for "/" if it does not exist
• The tricky part: create a new @Component that gets all instances of Days injected, but DO NOT gather them manually.
• the new component must return a list of all days ind status ordered by day numbers (1...n)
• make sure the root route returns the list, preferably as JSON