Implemented phase 6 for the POC prototype in the Website service.

Services/Website/Sources/Library/Internal/Components/SiteHeader.swift

@@ -98,7 +98,7 @@ private extension SiteHeader {
         }
     }
 
-    /// The format links, plus the series link shown on tablet only.
+    /// The format links, plus the series and events links shown on tablet only.
     var navigation: some HTML {
         nav(
             .class("site-nav"),
@@ -134,6 +134,12 @@ private extension SiteHeader {
             ) {
                 "Series"
             }
+            a(
+                .class("site-nav__link site-nav__link--extra"),
+                .href(.Route.events)
+            ) {
+                "Events"
+            }
         }
     }