Complete markdown support

- Update markdown parser to v15.0.5
- Add credit to markedjs/marked
- UI adjust

module/webui/styles/applist.css

@@ -80,32 +80,36 @@
 }
 
 .update-content {
-    max-height: 85vh;
     padding: 0 30px;
-    overflow-y: auto;
 }
 
 .update-content h3 {
     font-size: 22px;
+    margin: 0;
 }
 
-.update-content ul {
+.changelog {
+    max-height: 65vh;
+    overflow-y: auto;
+}
+
+.changelog ul {
     padding-left: 0;
     margin: 0;
 }
 
-.update-content ul li {
+.changelog ul li {
     margin-left: 15px;
     margin-bottom: 5px;
     list-style-type: disc;
 }
 
-.update-content a {
+.changelog a {
     color: #6E6E6E;
     cursor: none;
 }
 
-.update-content a:active {
+.changelog a:active {
     color: blue;
 }