fix: added timeline link to menu

Author: ErikBjare

_includes/header.pug

@@ -46,4 +46,7 @@ html
                 a.dropdown-item.text-secondary.font-weight-bold(href='/ci/')
                   i.fa.fa-cogs.mr-2
                   | Continuous Integration
+                a.dropdown-item.text-secondary.font-weight-bold(href='/timeline/')
+                  i.fa.fa-clock-o.mr-2
+                  | Timeline
                 //div class="dropdown-divider"></div