Update logo in theme explorer navbar

Author: tcbegley

docs/templates/macros/theme-explorer-navbar.html

@@ -1,11 +1,11 @@
 {% macro theme_explorer_navbar() -%}
 <nav class="navbar navbar-expand navbar-dark sticky-top bg-dark">
   <span
-    class="me-2 bg-white"
+    class="mx-2 bg-white"
     style="padding:2px;border-radius:4px;margin-right: 0.5rem;"
   >
     <img
-      src="/static/images/dbciconblack128.png"
+      src="/static/images/dbclogo128.png"
       width="36"
       height="36"
       alt="dbc logo thumbnail"