message: chore: Add Kiwi.com as a Backstage adopter
diff: | [SDA SE](https://sda.se) | [@Fox32](https://github.com/Fox32) | Central place for developing and sharing services in our insurance ecosystem. |
  | [H-E-B](https://www.heb.com) | [@german-j-rodriguez](https://github.com/german-j-rodriguez) | Initial work on Engineering Portal service platform. |
  | [American Airlines](https://www.aa.com) | [@paulpach](https://github.com/paulpach) | Central place for developers to develop and maintain applications |
  +| [Kiwi.com](https://kiwi.com) | [@aexvir](https://github.com/aexvir) | Replacing the frontend of [The Zoo](https://github.com/kiwicom/the-zoo), their service registry. |
  