Update brand section in header with image

Replaced brand icon with an image for devtemDesign.

Author: Figsh

builder.html

@@ -37,7 +37,7 @@
 
 <!-- HEADER -->
 <header class="app-header">
-  <div class="brand"><i class="fas fa-cube"></i> devtemDesign</div>
+  <div class="brand"><i><img src="https://fscss.devtem.org/assets/images/fscss.png" alt="FSCSS" width="30px" height="30px"></i> devtemDesign</div>
   <span class="sep">/</span>
   <span class="sub">Builder</span>
   <div class="header-right">