Drop D3 import

dashboard/index.html

@@ -53,12 +53,7 @@
       Trending Topics on <input type="date" v-model="date" v-on:change="loadHashtags">
     </h1>
     <div class="row">
-      <div class="col-md-8">
-        <!--
-            D3.js: Bubble for each hashtag, size is relative to popularity
-          -->
-      </div>
-      <div class="col-md-4">
+      <div class="col-md-6 offset-md-3">
         <!-- hashtag ranking -->
         <table class="table table-striped table-hover" v-if="hashtagRanking.length">
           <thead>
@@ -95,7 +90,6 @@
   <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"></script>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.2.1/js/bootstrap.min.js"></script>
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js"></script>
   <script src="https://cdn.jsdelivr.net/npm/gun/gun.js"></script>
   <script src="https://cdn.jsdelivr.net/npm/gun/lib/then.js"></script>