add logo to demo

Author: J38

src/edu/stanford/nlp/pipeline/demo/corenlp-brat.css

@@ -8,6 +8,21 @@
   height: auto;
   margin: 0 auto -6ex;
   padding: 0 0 6ex;
+  text-align: center;
+}
+
+#logo {
+  display: block;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+#logo-image {
+    height:20%
+}
+
+#version-num {
+  font-size: 20px;
 }
 
 .pattern_tab {

src/edu/stanford/nlp/pipeline/demo/corenlp-brat.html

@@ -27,9 +27,12 @@
 <!-- A header bar -->
 <nav class="navbar navbar-default navbar-static-top">
   <div class="container">
-    <div class="navbar-header">
-      <a class="navbar-brand" href="https://stanfordnlp.github.io/CoreNLP/">Stanford CoreNLP 4.2.0 (updated 2020-11-16)</a>
+    <div id="logo">
+      <a href="https://stanfordnlp.github.io/CoreNLP/">
+        <img id="logo-image" src="https://nlp.stanford.edu/img/corenlp-title.png">
+      </a>
     </div>
+    <div id="version-num">version 4.2.1<br><br><br></div>
   </div>
 </nav>