message: docs: use vector screenshot
diff: @@ -65,7 +65,7 @@ function Cover () {
  </ButtonRow>
  </div>
  <div>
  - <StageImage src="https://patternplate.github.io/media/images/screenshot-site.png"/>
  + <StageImage src="https://patternplate.github.io/media/images/screenshot-site.svg"/>
  </div>
  </Stage>
  </div>
  @@ -157,6 +157,9 @@ const StageImage = styled.img`
  top: auto;
  width: 600px;
  top: 100%;
  + border-radius: 10px;
  + overflow: hidden;
  + box-shadow: -10px -10px 20px rgba(0, 0, 0, .15);
  @media screen and (min-width: 480px) {
  top: 85%;
  