Tumblr takeover (#5908)

* frontify added direct link to issue; wordpresslogin: added another case

* filename same as id + using same filename formatting

* renamed files, more info to pantheon-upstream.yaml

* false positive fix

takeovers/tumblr-takeover.yaml

@@ -25,4 +25,5 @@ requests:
         dsl:
           - '!contains(host,"tumblr.com")'
           - '!contains(host,"txmblr.com")'
+          - '!contains(host,"umblr.com")'
         condition: and