Put `Manager` inside application context

[chshersh]

[vrom911]

Initial work is done here: https://github.com/kowainik/hintman/tree/vrom911/69-Put-Manager-inside-application-context Seems like much more effort should be applied to get this done. Will get back to this one later.

[chshersh]

@vrom911 Makes sense. I checked your branch, looks nice :+1: And at the same time this indeed looks like too much work just for moving one variable to the environment :disappointed: Probably we can do this later, don't worry!