💄 style: set transparent bg for code in table headers

Changed the background color of the `code` tags within table headers
to transparent to enhance readability and contrast. This ensures
that the code tags in headers remain visually distinct
while not detracting from overall table aesthetics.

sass/parts/_table.scss

@@ -18,6 +18,10 @@ table {
     thead tr {
         background-color: var(--primary-color);
         color: var(--hover-color);
+
+        code {
+            background-color: transparent;
+        }
     }
 
     tbody {