renaming backend, cellxgene to server, client respectively

client/index.html

@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>Cellx</title>
+    <link href="https://fonts.googleapis.com/css?family=Roboto:400,400i,700" rel="stylesheet">
+    <style>
+      html, body, p, h1, h2, h3, h4, h5, h6, span, button, input {
+        font-family: 'Roboto','Helvetica Neue','Helvetica','Arial',sans-serif;
+        font-size: 16px;
+      }
+      body {
+        margin: 0;
+        padding: 0;
+      }
+
+      * {
+        box-sizing: border-box;
+      }
+    </style>
+  </head>
+  <body>
+    <noscript>If you're seeing this message, that means <strong>JavaScript has been disabled on your browser</strong>, please <strong>enable JS</strong> to make this app work.</noscript>
+
+    <div id="root"></div>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.10.0/d3.js"></script>
+    <script src="//d3js.org/d3-scale-chromatic.v0.3.min.js"></script>
+  </body>
+</html>