[doc] Update Codegen doc to use Server Preset
Hello 👋 
I'm from [The Guild](https://the-guild.dev/) and I want to propose updating the [Generating TS types](https://www.apollographql.com/docs/apollo-server/workflow/generate-types) to use the [Server Preset](https://the-guild.dev/graphql/codegen/docs/guides/graphql-server-apollo-yoga-with-server-preset) instead of the current setup.

This is now our recommended way to write server code, and I believe it gives users much better DevX:
- has automatic type wireup for better type-safety
- results in less runtime errors
- easier typeDefs and resolvers setup

I'm thinking to keep the similar flow to the current doc and only update relevant bits to keep it short. Happy to chat more! 🙂