Explorer: Expand search to account for multiple hosts with the same URL/multiple items for a given query

[telestrial]

As is, two hosts can declare their netAddress to be the same URL:PORT. There are many good reasons for this--DNS reuse or reconfiguration, for example. However, in the explorer, our search feature is capable of either:

1. Routing the user directly to the one display page that matches the given query
2. Alerting the user that it can't do this, for whatever reason

There is currently no "multiple results found" visual flow. This could look like an attached window at the bottom of the search bar that displays search results. It could also be a page in and of itself.

• What information is valuable to a user that is trying to discern which host to navigate to, in this flow? My inclination right now is that it's mainly publicKey and firstSeen/host age.
• Are hosts the only type where this would be useful?

In the mean time, I am merging #982. If multiple hosts are found, we alert the user to search using the public key.