Add Flutter Commmunity to authors, change repo home

pubspec.yaml

 name: font_awesome_flutter
 description: The Font Awesome Icon pack available as Flutter Icons. Provides 1500 additional icons to use in your apps.
-author: Brian Egan <brian@brianegan.com>
-homepage: https://github.com/brianegan/font_awesome_flutter
+maintainer: Brian Egan <brian@brianegan.com>
+authors:
+  - Flutter Community <community@flutter.zone>
+  - Brian Egan <brian@brianegan.com>
+homepage: https://github.com/fluttercommunity/font_awesome_flutter
 version: 8.6.0
 
 environment: