Add bluesky icon

Author: MaelRL

_includes/themes/cgal/default.html

@@ -33,7 +33,7 @@
     <!--[if lt IE 7]>
         <p class="chromeframe">You are using an <strong>outdated</strong> browser. Please <a href="http://browsehappy.com/">upgrade your browser</a> or <a href="http://www.google.com/chromeframe/?redirect=true">activate Google Chrome Frame</a> to improve your experience.</p>
         <![endif]-->
-    
+
 
     <!-- Navigation & Logo-->
     <div class="mainmenu-wrapper">
@@ -124,17 +124,23 @@ <h1>{{ page.title }} {% if page.tagline %} <small>{{ page.tagline }}</small>{% e
         </div>
       </div>
     </div>
-    
+
     {{ content }}
-    
+
     <!-- Footer -->
     <div class="footer">
       <div class="container">
         <div class="col-md-12">
           <div class="footer-copyright">
+            <div style="float: left;">
+              <a href="https://bsky.app/profile/thecgalproject.bsky.social" alt="The CGAL Project on Bluesky">
+                <img src="{{ site.baseurl }}/images/icons/bluesky.svg" class="center-block btn-dark-orange" alt="Bluesky" height="16"></img>
+              </a>
+            </div>
+            <div style="float: left; width: 10px;">&nbsp;</div>
             <div style="float: left;">
               <a href="https://twitter.com/TheCGALProject" alt="The CGAL Project's Twitter">
-                <img src="{{ site.baseurl }}/images/icons/twitter.svg" class="center-block btn-dark-orange" alt="Twitter" height="18"></img>
+                <img src="{{ site.baseurl }}/images/icons/twitter.svg" class="center-block btn-dark-orange" alt="Twitter" height="16"></img>
               </a>
             </div>
             &copy; 1995-{{site.time | date: "%Y"}} The CGAL Project. All rights reserved.