feat(showcase): add Flyright to the Gatsby site showcase (#9856)

Hi all, we built our company site with Gatsby, Contentful and Netlify! 

Thanks for building such an amazing ecosystem ❤️

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docs/sites.yml

@@ -3297,3 +3297,14 @@
   built_by: Andrew Wilson
   built_by_url: https://github.com/andwilson
   featured: false
+- title: Flyright
+  url: https://flyright.co/
+  main_url: https://flyright.co/
+  description: >-
+    Flyright curates everything you need for international travel in one tidy place 💜
+  categories:
+    - Technology
+    - App
+  built_by: Ty Hopp
+  built_by_url: https://github.com/tyhopp
+  featured: false