Changes

tsk55 Fixes in explore component
Interfaces previously declared in explore.component.ts are now declared
and exported in the interfaces directory, making them accessible
globally. Their values have also been instantiated an exported as a
constant. Now the explore stories view updates the stories shown when
one of the inputs is changed instead when pressing the "explore" button,
which has been changed to a
"search" button that redirects the user to the search view.