menu: update to reflect current state

Drop Legacy KernelCI link as that was killed already.
And remove WIP mark from the dashboard.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>

kernelci.org/config.toml

@@ -88,14 +88,9 @@ footer_about_disable = false
     url = "/"
   [[menu.main]]
     identifier = "dashboard"
-    name = "Dashboard (WIP)"
+    name = "Dashboard"
     url = "https://dashboard.kernelci.org/"
 
-    [[menu.main]]
-    identifier = "legacy"
-    name = "Legacy KernelCI"
-    url = "https://linux.kernelci.org/job"
-
   [[menu.main]]
     identifier = "blog"
     name = "Blog"