Search bar should be directly editable

[chadlupkes]

Summary

When we do a search, we have the option to add that search feed to our home page, but there is no way to edit the search on the fly.

Basic example

I'd love to be able to click to edit the search directly, but a clickable link to edit the search would also be useful. Right now the only thing we can do is type a new search from scratch.

Motivation

This would make it easier to find new content that we want.