Introduce and use print.css

app/views/favorites/_nav.html.erb

@@ -3,4 +3,6 @@
   <%= link_to 'Courses', favorites_courses_url %>
   <%= link_to 'Theses', favorites_theses_url %>
   <%= link_to 'Projects', favorites_projects_url %>
-</div>
+
+  <%= link_to "Print", '#', onclick: "print()" %>
+</div>

app/views/layouts/application.html.erb

@@ -5,7 +5,9 @@
     <%= csrf_meta_tags %>
     <%= csp_meta_tag %>
 
+
     <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
+    <%= stylesheet_link_tag 'print', media: 'print' %>
     <%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>
 
     <meta content="width=device-width, initial-scale=1, maximum-scale=1" name="viewport">
@@ -43,4 +45,5 @@
     </main>
 
   </body>
+
 </html>