chore: removed the handbook for external cards

_layouts/landing.html

@@ -79,16 +79,6 @@
                 <div class="left-inner-container" id="left-inner-container" ondrop="window.cardDropDiscard(event)" ondragover="window.allowDrop(event)">
                 </div>
                 <div class="right-inner-container" id="right-inner-container" ondrop="window.cardDrop(event)" ondragover="window.allowDrop(event)">
-                    <a class="card-link" href="/#handbook-1-general">
-                        <div class="card-pinned card-red">
-                            <div class="card-header">
-                                <div class="card-icon"><i class="large material-icons">book</i></div>
-                            </div>
-                            <div class="card-content">
-                                <div class="card-title">Handbook</div>
-                            </div>
-                        </div>
-                    </a>
                     <div id="drop-to-add" class="card-pinned card-grayed card-pulsate">
                         <div class="card-header">
                             <div class="card-icon"><i class="large material-icons">add</i></div>