Mark status page concept as implemented

The status page has now been implemented for Apertis, mark the document as
such.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

content/concepts/status-page-review.md

@@ -4,6 +4,8 @@ weight = 100
 
 outputs = [ "html", "pdf-in",]
 date = "2021-02-15"
+status = "Implemented"
+statusDescription = "This functionality has now been implemented"
 +++
 
 # Introduction