Merge branch '76-forward-logged-user-to-their-dashboard-clicking-on-sign-in-button' into 'master'

Resolve "Forward logged user to their dashboard clicking on "Sign In" button"

Closes #76

See merge request totem/website!64

source/partials/_nav.html.erb

@@ -42,7 +42,7 @@ end
               </div>
             </li>
             <li class="nav-item">
-                <a class="nav-button nav-link" href="https://learn.totem-project.org/login">
+                <a class="nav-button nav-link" href="https://learn.totem-project.org/dashboard">
                     <button type="button" class="btn btn-primary">
                       <%= t :'nav.sign_in' %>
                     </button>