message: add: Amazon styling to generated doc index page
diff: @@ -27,6 +27,38 @@ git diff --name-only $BASE_COMMIT_SHA -- $(git rev-parse --show-toplevel)/rust-r
  echo '<html>'
  echo '<head>'
  echo ' <metadata charset="utf-8">'
  + echo " <style>"
  + echo " html {"
  + echo " font-size: 62.5%;"
  + echo " }"
  + echo " body {"
  + echo " max-width: 900px;"
  + echo " margin: 0 auto;"
  + echo " font-size: 1.6rem;"
  + echo " font-family: AmazonEmber, Helvetica Neue, Helvetica, Arial, sans-serif;"
  + echo " line-height: 1.6;"
  + echo " font-weight: 400;"
  + echo " color: #333;"
  + echo " }"
  + echo " h2 {"
  + echo " background-color: #232f3e;"
  + echo " color: white;"
  + echo " padding: 1rem;"
  + echo " }"
  + echo " a {"
  + echo " color: #007eb9;"
  + echo " outline: 0;"
  + echo " text-decoration: none;"
  + echo " }"
  + echo " a:visited {"
  + echo " color: #005b86;"
  + echo " }"
  + echo " a:active, a:hover {"
  + echo " outline: 0;"
  + echo " color: #e47911;"
  + echo " text-decoration: underline;"
  + echo " }"
  + echo " </style>"
  echo " <title>Doc preview: ${DOC_TITLE_CONTEXT}</title>"
  echo '</head>'
  echo '<body>'
  