docs: remove non production notice (ratify-project#1102)

README.md

@@ -6,9 +6,6 @@
 
 Is a verification engine as a binary executable and on Kubernetes which enables verification of artifact security metadata and admits for deployment only those that comply with policies you create.
 
-**WARNING:** This is not considered production-grade code
-by its developers, nor is it "supported" software.
-
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