internal/frontend: link search results to overview tab
internal/frontend: link search results to overview tab

Updates b/143953613

Change-Id: Ia5ea4f1d5b62b8e5f2d4e8579b532a09c7aa2bec
Reviewed-on: https://team-review.git.corp.google.com/c/golang/discovery/+/594570
Reviewed-by: Jonathan Amsterdam <e3d3698b2ccd5955e4adf250d0785062d0f9018b@google.com>

golang/pkgsite,golang/pkgsite,golang/pkgsite,golang/pkgsite