When using a single Ember route, the query param filters did not
properly reset when, for example, clicking the Knowledge Explorer link
in the hamburger menu.
This commit introduces a subroute where most of the logic takes place.
We needed a subroute so that refresh doesn't take out the entire UI part.
This allows us to use the `refreshModel` option for query params on the
route and remove the refresh controller action. Doing so also retains
state of the search field instead of fully reloading the parent route.
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