Add CfP deadline to home page (#213)

Signed-off-by: weeman <weeman@frankfurt.ccc.de>

Author: weeman1337

src/components/CfP.astro

@@ -12,8 +12,27 @@ import PrimaryCta from "./PrimaryCta.astro";
         font-size: 1.125rem;
         margin-block: 1rem;
     }
+
+    .deadline {
+        display: block;
+    }
+
+    @media(min-width: 800px) {
+        .deadline {
+            display: inline;
+        }
+
+        .deadline:before {
+            content: ' - ';
+        }
+    }
 </style>
-<h2>Call for Proposals</h2>
+<h2>
+    Call for Proposals
+    <small class="deadline">
+        open until 14th June 2026
+    </small>
+</h2>
 <div>
     <p>Whether you want to talk about decentralisation, encryption, Matrix internals, safety, sovereignty of digital communication, community, collaboration in the public sector, UX, or showcase your fun experiments, there is a track for you at #MatrixConf.</p>
     <p>We welcome proposals from individuals innovating around Matrix, organisations working with Matrix, and everyone contributing to digital sovereignty.</p>