Add Open Spaces page to Programme Overview

Open Spaces link added to the Programme - Overview page under 'Open Spaces'

Author: marinamorolopez

src/pages/overview.astro

@@ -137,7 +137,7 @@ const imageStyle = "m-2 md:float-right max-w-[300px] md:max-w-[400px] lg:max-w-[
           />
 
         <ul class="event-list">
-          <li>Will be added soon!</li>
+          <li><a href="/open-spaces">Open Spaces</a></li>
         </ul>
       </div>