chore(readme): remove production readiness notice from README

Author: leggetter

sdks/go/README.md

@@ -9,11 +9,6 @@ Developer-friendly & type-safe Go client specifically catered to leverage the Ou
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-> [!IMPORTANT]
-> This SDK is not yet ready for production use. To complete setup please follow the steps outlined in your [workspace](https://app.speakeasy.com/org/speakeasy-onboarding/onboarding). Delete this section before > publishing to a package manager.
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 <!-- Start Summary [summary] -->
 ## Summary