Follow the OS dark mode with a softer, readable palette

Elternbeirat.Web/Features/Home/Home.razor.css

@@ -1,4 +1,6 @@
 .intro {
     font-size: 1.1rem;
-    color: #444;
+    /* Softer than body text, via the token -- so it adapts in dark mode instead of
+       staying a fixed dark grey that turns unreadable there. */
+    color: var(--color-text-soft);
 }