style: add box-shadow to table icons for depth

Author: julioest

docs/ui/src/css/doc.css

@@ -407,13 +407,13 @@
 
 .doc .admonitionblock td.icon i {
   align-items: center;
-  border-radius: 0.45rem;
   display: inline-flex;
   filter: initial;
   height: 1.25rem;
   padding: 0 0.5rem;
   vertical-align: initial;
   width: fit-content;
+  box-shadow: 2px 2px #000;
 }
 
 .doc .admonitionblock td.icon i::after {