DOC: put in place holder for 3.5.0 release announcement link

Author: tacaswell

docs/body.html

@@ -133,7 +133,7 @@ <h1>Matplotlib: Visualization with Python</h1>
           <h3>News</h3>
           <div class="news__item--highlight">
             <h5 class="date">November 15, 2021</h5>
-            <a href="" class="link--offsite">Matplotlib 3.5.0 Released</a>
+            <a href="https://matplotlib.org/stable" class="link--offsite">Matplotlib 3.5.0 Released</a>
             <p>
               Highlights include <a href="https://matplotlib.org/devdocs/users/prev_whats_new/whats_new_3.5.0.html#subplot-mosaic-supports-simple-axes-sharing">shared axes in <span class="pre">subplot_mosaic</span></a>, post-colormaping <a href="https://matplotlib.org/devdocs/users/prev_whats_new/whats_new_3.5.0.html#image-interpolation-now-possible-at-rgba-stage"> resampling</a>, and support for <a href="https://matplotlib.org/devdocs/users/prev_whats_new/whats_new_3.5.0.html#gtk-backend">GTK4</a> and
               <a href="https://matplotlib.org/devdocs/users/prev_whats_new/whats_new_3.5.0.html#qt-backends">Qt6</a>.