content/static: fix various issues with homepage

+ Add blank alt text to decorative images (including the main image)
+ Preserve the main image ratio when sizing using CSS
+ Reduce the intrinsic size of the main image since we were displaying
  a much smaller version on the page
+ Adjust CSS for smaller viewports. Specifically, reduce top margins
  at smaller viewports
+ Update CSS to be mobile by default, with media queries covering
  wider viewports (to be in line with the other CSS across the site)
+ Update the background color of one of the footers to ensure we have
  satisfactory contrast ratio as reported by Lighthouse
+ Use smart quotes around sample searches
+ Transform the label text for example searches using CSS instead
  of directly typing in all caps

Updates golang/go#40504

Change-Id: I55d2823094d9968d00c6d48e64b10af5abd965f6
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/248185
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jamal Carvalho <jamal@golang.org>

0 files changed, 0 insertions, 0 deletions