Add copy button to code blocks for improved documentation usability

Author: Shrikantgiri25

docs_theme/css/copy-button.css

@@ -6,16 +6,15 @@
   padding: 2px 6px;
   cursor: pointer;
 
-  background: #f7f7f9;        /* code block bg */
-  border: 1px solid #e1e1e8;  /* code block border */
+  background: #f7f7f9;
+  border: 1px solid #e1e1e8;
   border-radius: 3px;
 
-  color: #dc322f !important;  /* fallback if no span */
+  color: #dc322f !important;
 
   box-shadow: 0 1px 1px rgba(0,0,0,0.04);
 }
 
-/* Separate rule for the span inside the button */
 .copy-block-button span {
   color: #dc322f !important;
 }