Disabled volunteering application button (#1618)

Volunteering applications are closed now.

Author: ivellios

src/content/pages/volunteering.mdx

@@ -101,10 +101,10 @@ Please acknowledge our [Data Privacy Policy](https://forms.gle/PCP7bXvdH1QhDBPn6
 We will get back to you with more details and information on how to proceed.
 Thanks ❤️
 
-**The Call for Volunteers closes on Sunday, May 31st!**
+**Applications are now closed. Thank you to everyone who applied!**
 
 <div class="text-center mb-8">
-<Button url="https://docs.google.com/forms/d/e/1FAIpQLSc1aVIdt4TzKQ7wEIM8kssbauLz35SOGWDTvTIQdLTbMsyxtg/viewform?usp=header">Apply to Volunteer</Button>
+<Button disabled>Applications Closed</Button>
 </div>
 
 ## More information