fix: adjust line number margins and text color in Shiki styles

Author: pheralb

apps/website/src/styles/shiki.css

@@ -34,10 +34,10 @@ pre.shiki-line-numbers code:has(.line:nth-child(2)) .line::before {
   content: counter(step);
   counter-increment: step;
   width: 0.5rem;
-  margin-right: 1rem;
-  margin-left: 0.3rem;
+  margin-right: 1.3rem;
+  margin-left: 0.2rem;
   display: inline-block;
-  @apply text-right font-mono text-xs text-neutral-400 dark:text-neutral-600;
+  @apply text-right font-mono text-xs text-neutral-500;
 }
 
 /* Shiki Highlight */