Remove broken plugin spotlight from the front page

It was never fully migrated from the fiji.github.io site.

I briefly tried dropping in the missing slugify function, and it
could be made to work, but I'd like to have a group discussion
before deciding to add a plugin carousel to the imagej.net wiki.

Author: ctrueden

index.html

@@ -150,54 +150,3 @@ <h2>Free &amp; Open Source</h2>
       </div>
     </div>
   </div>
-
-<!-- Spotlight -->
-<!-- Bootstrap core JavaScript
-     ================================================== -->
-  <!-- Placed at the end of the document so the pages load faster -->
-  <script src="/assets/js/jquery-3.4.1.min.js"></script>
-  <script>
-    let first = true;
-    const MAX_PLUGIN_COUNT = 6; // controls max number of tabs shown
-
-    $.getJSON("/plugins.json", function(json) {
-      let plugins = json.plugins;
-      // Fisher-Yates shuffle; see: https://javascript.info/task/shuffle
-      for (let i = plugins.length - 1; i > 0; i--) {
-        let j = Math.floor(Math.random() * (i + 1)); // random index from 0 to i
-        [plugins[i], plugins[j]] = [plugins[j], plugins[i]]; // swap elements
-      }
-      if (plugins.length > MAX_PLUGIN_COUNT){
-        plugins = plugins.slice(0,MAX_PLUGIN_COUNT);
-      }
-      plugins.map(function(val){
-        // generating the tab header
-        let nameSlug = 'plugin-' + slugify(val.name);
-        let tabString = `
-          <li class="nav-item">
-            <a class="nav-link ${first ? 'active' : ''}" id="${nameSlug}-tab-header" data-toggle="tab" href="#${nameSlug}-tab" role="tab" aria-controls="${nameSlug}" aria-selected="true">${val.name}</a>
-          </li>
-        `
-
-        // generating the tab panel
-        let paneString = `
-        <div class="tab-pane fade ${first ? 'show active' : ''}" id="${nameSlug}-tab" role="tabpanel" aria-labelledby="${nameSlug}-tab-header">
-          ${val.imgUrl ?
-            '<img class="img-fluid img-plugin" alt="image showing ' + val.name + ' in action" src = "' + val.imgUrl + '" /> <hr />'
-            : ''
-          }
-          <h5 class="card-title">${val.name}</h5>
-          <p class="card-text">${val.description}</p>
-          <a href="${val.link}" class="btn btn-primary">More information</a>
-        </div>
-        `
-        $("#plugin-tabs").append(tabString);
-        $("#plugin-tab-content").append(paneString);
-
-
-        if (first){
-          first = false;
-        }
-      })
-    });
-  </script>