Update signatures.yaml

Author: Poolitzer

src/data/signatures.yaml

@@ -121,6 +121,9 @@
 - organization: "Molly"
   url: "molly.im"
   poc: "Oscar Mira <valldrac@molly.im>"
+- organization: "NewPipe e.V."
+  url: "newpipe-ev.de"
+  poc: "The Board <board@newpipe-ev.de>"
 - organization: "Nextcloud"
   url: "nextcloud.com"
   poc: "Jos Poortvliet <jos.poortvliet@nextcloud.com>"