static/frontend/search: bold metadata
static/frontend/search: bold metadata

Bold num imported by, version, and commit time based on mocks at
https://gallery.googleplex.com/files/c46280fcc23b4aae99948b265e5c07d0

For golang/go#47320

Change-Id: Ic98a7ea797d86481174090b22af77b8b9aad3478
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/341174
Trust: Julie Qiu <8d32267b6b4884cf35adeaccde2b6857ae11aace@golang.org>
Run-TryBot: Julie Qiu <8d32267b6b4884cf35adeaccde2b6857ae11aace@golang.org>
Reviewed-by: Jamal Carvalho <e0195770807aa8c82b0b128d9c0423b5ad035172@golang.org>

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