Allow deep linking to specific entries

[myersjustinc]

It's great that we're able to go to a Harvester form that has an index configured, fill out the search form and pull up the latest entries (or a blank form) for the specified index—but for ease of communication, it'd also be useful to be able to link directly to that entry as needed.

Put differently: Rather than give someone (e.g., by email) the instructions to go to https://harvester.ap.org/d/1Bhmk_cLtqd7VjOUnnfHEeFltztZ_yCuisdrYFctCLFs and search for Sir Launcelot of Camelot, can we just send a link to https://harvester.ap.org/d/1Bhmk_cLtqd7VjOUnnfHEeFltztZ_yCuisdrYFctCLFs#index=Sir+Launcelot+of+Camelot?

[myersjustinc]

Seems like if that argument is specified, we could just have the page automatically fire off the request to the form's /current as we currently do, just without the need for clicking the search button.