Add a "Change this gopher" button to the result page

Each result has a unique URL that can be saved and retrieved later.

Idea: Add a button to the result page that opens the gopherizer with the saved gopher as a starting point, so that people can modify their saved gophers rather than having to start from scratch.

Start at the result page and trace how its unique URL retrieves the saved gopher, then follow the gopherizer entry point used to create or edit one. Add a way for the saved gopher to open in the gopherizer as the starting point, and verify that the result-page button preserves the saved data for editing.

Written by the indexing model from the issue text.