feat: add FileBird plugin

Author: tedw

composer.json

@@ -47,6 +47,7 @@
     "wpackagist-plugin/duplicate-post": "^4.5.0",
     "wpackagist-plugin/enable-media-replace": "^4.1.5",
     "wpackagist-plugin/favicon-by-realfavicongenerator": "^1.3.32",
+    "wpackagist-plugin/filebird": "^6.3.2",
     "wpackagist-plugin/pantheon-advanced-page-cache": "^2.1.0",
     "wpackagist-plugin/pantheon-hud": "^0.4.3",
     "wpackagist-plugin/query-monitor": "^3.16.4",