Merge branch 'update-copyright-info' into 'master'

Update copyright info, remove broken link

See merge request !27

content/page/copyright.md

@@ -8,13 +8,10 @@ Briar is free software. You can redistribute it and modify it under the
 terms of the [GNU General Public
 License](https://gnu.org/licenses/gpl.txt).
 
-Google Play and the Google Play logo are trademarks of Google Inc. The
-Android robot is reproduced or modified from work created and shared by
-Google and used according to terms described in the [Creative Commons
-3.0 Attribution License](https://creativecommons.org/licenses/by/3.0).
+Google Play and the Google Play logo are trademarks of Google Inc.
 
 The mobile phone image is reproduced or modified from work created and
-shared by [Vernon Chan](https://secure.flickr.com/photos/vernieman) and
+shared by Vernon Chan and
 used according to terms described in the [Creative Commons 2.0
 Attribution License](https://creativecommons.org/licenses/by/2.0).