message: docs(docs): Update Vue School Summer Sale banner
diff: <img src="/images/vueschool/vs-backpack.png" alt="Backpack">
  </div>
  <div class="vs-slogan">
  - Less than <span class="vs-slogan-light">48 hours</span> left for the Vue School offer
  + Extended! <span class="vs-slogan-light">Last few hours</span> for the Vue School offer
  </div>
  <div class="vs-button">
  GET ACCESS
  @media (min-width: 680px) {
  #vs .vs-core .vs-backpack {
  position: static;
  + margin-right: 0;
  }
  #vs .vs-core .vs-backpack img {
  }
  }
  +@media (min-width: 900px) {
  + #vs .vs-core .vs-backpack {
  + margin-right: 14px;
  + }
  +}
  +
  #vs .vs-core .vs-slogan {
  color: #FFF;
  font-weight: bold;
  