[x/go.dev] web dev polish
[x/go.dev] web dev polish

Change-Id: Iaa3b005002bcdab045ee85ecd6297aef19bededc

X-GoDev-Commit: e92db7854325c718f96f5140c5575f7d37ffca0d

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website