Update the ADS link for the fill reference list

Signed-off-by: Bruno Khélifi <khelifi@in2p3.fr>

about.html

@@ -176,7 +176,9 @@ <h2 id="publications"><a href="#pub"> Publications </a></h2>
             </li>
         </ul>
 
-        <p> The full list of publications using Gammapy can be found with this <a href="https://ui.adsabs.harvard.edu/search/q=(%20(citations(doi%3A%2210.1051%2F0004-6361%2F201834938%22)%20OR%20citations(bibcode%3A2017ICRC...35..766D))%20AND%20year%3A2014-2023)&sort=date%20desc%2C%20bibcode%20desc&p_=0">link</a></p>.
+        <p> The <strong>full list of publications using Gammapy</strong> can be found with this
+            <a href="https://ui.adsabs.harvard.edu/search/q=(%20(citations(doi%3A%2210.1051%2F0004-6361%2F201834938%22)%20OR%20citations(doi%3A%2210.1051%2F0004-6361%2F202346488%22)%20OR%20citations(bibcode%3A2017ICRC...35..766D))%20AND%20year%3A2014-2023)&sort=date%20desc%2C%20bibcode%20desc&p_=0">link</a>.
+        </p>
 
         <br><br>
         <h2 id="awards"><a href="#awards"> Awards and Prizes </a></h2>