message: Add CSS style sheet to preprocessed documentation and landing pages.
  Remove first button from rendered notebooks (already on page).
  Quarantine the home page a bit.
diff: @@ -2,6 +2,7 @@ project_path: /_project.yaml
  book_path: /_book.yaml
  description: <!--no description-->
  landing_page:
  + custom_css_path: /site-assets/css/style.css
  show_side_navs: True
  rows:
  - description: >
  @@ -14,57 +15,6 @@ landing_page:
  </p>
  items:
  - custom_html: >
  - <style>
  - .tfo-button-primary {
  - background-color: #fca851;
  - }
  - .tfo-button-primary:hover {
  - background-color: #ef6c02;
  - }
  -
  - a.colab-button {
  - display: inline-block;
  - background: rgba(255, 255, 255, 0.75);
  - padding: 4px 8px;
  - border-radius: 4px;
  - font-size: 11px!important;
  - text-decoration: none;
  - color:#aaa;border: none;
  - font-weight: 300;
  - border: solid 1px rgba(0, 0, 0, 0.08);
  - border-bottom-color: rgba(0, 0, 0, 0.15);
  - text-transform: uppercase;
  - line-height: 16px
  - }
  - a.colab-button:hover {
  - color: #666;
  - background: white;
  - border-color: rgba(0, 0, 0, 0.2);
  - }
  - a.colab-button span {
  - background-image: url("/images/colab_logo_button.svg");
  - background-repeat:no-repeat;background-size:20px;
  - background-position-y:2px;display:inline-block;
  - padding-left:24px;border-radius:4px;
  - text-decoration:none;
  - }
  -
  - /* adjust code block for smaller screens */
  - @media screen and (max-width: 1000px) {
  - .tfo-landing-row-item-code-block {
  - flex-direction: column !important;
  - }
  - .tfo-landing-row-item-code-block > .devsite-landing-row-item-code {
  - /*display: none;*/
  - width: 100%;
  - }
  - }
  - @media screen and (max-width: 720px) {
  - .tfo-landing-row-item-code-block {
  - display: none;
  - }
  - }
  - </style>
  <div class="devsite-landing-row-item-description">
  <h3 class="hide-from-toc">Learn and use ML</h3>
  <div class="devsite-landing-row-item-description-content">
  