Update button

Author: clytaemnestra

src/content/pages/volunteers.mdx

@@ -101,7 +101,7 @@ We will get back to you with more details and information on how to proceed.
 Thanks ❤️
 
 <div class="text-center mb-8">
-<Button url="https://forms.gle/rSWsgnxS5gmXrrZ97">Register your interest now!</Button>
+<Button url="https://forms.gle/rSWsgnxS5gmXrrZ97">Already closed</Button>
 </div>
 
 ## More information