chore: remove code generation documentation and helper scripts (#583)

Author: farleyb-amazon

README.md

@@ -24,21 +24,6 @@ so they can only be run when embedding this library into one of the compilation
 
 - [.NET](https://github.com/awslabs/aws-encryption-sdk-net)
 
-## Generate code
-
-TODO: remove before launch; customers wont' be using this
-
-If you change any of the ESDK model files you will need to re-run our code generators to generate
-the API skeletons and shims. This is done via our [polymorph](https://github.com/awslabs/polymorph)
-package.
-
-First, clone that repository to some local location.
-
-Then, from the root of this repository, run `bin/generate-code.sh`,
-passing the root location of your polymorph repository as a parameter.
-
-Finally, you'll need to manually run a code formatter as described in the [README](./aws-encryption-sdk-net/Source/API/Generated).
-
 ## Generate Duvet Reports
 
 This repo uses Duvet to directly document the [specification](https://github.com/awslabs/aws-encryption-sdk-specification) alongside this implementation.