Fix dark mode icon for burger menu

Author: SableRaf

pcd-website/src/styles/global.css

@@ -108,6 +108,7 @@ body {
   border-radius: 6px;
   cursor: pointer;
   font-size: 1.25rem;
+  color: var(--color-text);
   display: flex;
   align-items: center;
   justify-content: center;