fix: add opacity for disabled button

Author: ivke995

apps/website/src/components/staff-agmentation/GetYourPlanForm.astro

@@ -78,6 +78,7 @@ import "../../styles/loader.css";
         font-medium
         group-invalid/contact-us:pointer-events-none
         group-invalid/contact-us:focus-visible:outline-transparent
+        group-invalid/contact-us:opacity-70
         bg-crocoder-yellow
         hover:bg-crocoder-yellow/90
         focus:bg-crocoder-yellow/90