Remove unnecessary bufbuild references (#105)

- Update connect-kotlin github link
- Update CLA assistant link (confirmed new link is valid)

.github/CONTRIBUTING.md

@@ -60,5 +60,5 @@ We're much more likely to approve your changes if you:
 
 [fork]: https://github.com/connectrpc/connect-kotlin/fork
 [open-issue]: https://github.com/connectrpc/connect-kotlin/issues/new
-[cla]: https://cla-assistant.io/bufbuild/connect-kotlin
+[cla]: https://cla-assistant.io/connectrpc/connect-kotlin
 [commit-message]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html

README.md

@@ -163,7 +163,7 @@ Offered under the [Apache 2 license][license].
 [conformance]: https://github.com/connectrpc/conformance
 [connect-go]: https://github.com/connectrpc/connect-go
 [connect-protocol]: https://connectrpc.com/docs/protocol
-[connect-swift]: https://github.com/bufbuild/connect-swift
+[connect-swift]: https://github.com/connectrpc/connect-swift
 [connect-es]: https://www.npmjs.com/package/@connectrpc/connect
 [error-handling]: https://connectrpc.com/docs/kotlin/errors
 [getting-started]: https://connectrpc.com/docs/kotlin/getting-started