docs: Update documentation and Doxygen documentation generation
diff --git a/docs/ns3_html_theme/static/ns3_stylesheet.css b/docs/ns3_html_theme/static/ns3_stylesheet.css
index c900197..fb55460 100644
--- a/docs/ns3_html_theme/static/ns3_stylesheet.css
+++ b/docs/ns3_html_theme/static/ns3_stylesheet.css
@@ -11,6 +11,11 @@
     font-weight: bold;
 }
 
+a:visited {
+    color: #91A501;
+    font-weight: bold;
+}
+
 /* Sphinx headings */
 div.body h1,
 div.body h2,