Update chat link

The discord channel has been archived and is no longer public.

Author: jyn514

templates/core/about/index.html

@@ -41,7 +41,7 @@ <h3 id="contact"> <a href="#contact">Contact</a> </h3>
         {%- set governance_link = "https://www.rust-lang.org/governance/teams/dev-tools#docs-rs" -%}
         <p>
             Docs.rs is run and maintained by the <a href="{{ governance_link | safe }}">Docs.rs team</a>.
-            You can find us in #docs-rs on <a href="https://discord.gg/f7mTXPW">Discord</a>.
+            You can find us in #t-docs-rs on <a href="https://rust-lang.zulipchat.com/#narrow/stream/356853-t-docs-rs">Zulip</a>.
         </p>
 
     </div>