Sharing searches link should go to the top of the search

[LeighKP]

Problem: Right now, when I share a search (e.g. https://pressbooks.directory/?q=liberated%20learners) the link will go to the top of the Directory with no clear indication that this is a filtered search. This is confusing for users, and makes such links unusable in marketing assets.

Solution: It would be neat if when a user clicks the link they would be taken to an anchor lower down on the page that displayed the search results. Like this:

[SteelWagstaff]

Note: when a user conducts a search, we do update page focus upon loading the query:

routing_behavior_directory.mp4

We do not update page focus when loading the query directly from the routing URL. Ideally, the behavior for both of these actions would be identical. When the Directory loads a page view which includes a routing URL, the page should load with 'Find a book' at the top of the browser and the active filters/search queries clearly visible:

See #433 for related improvement