docs: update README

Author: anveshdzangolab

packages/errorHandler/README.md

@@ -2,12 +2,6 @@
 
 A [Fastify](https://github.com/fastify/fastify) plugin that defines an opinionated config for an API.
 
-When registered on a Fastify instance, the plugin will:
-
-* decorate the Fastify instance with the `errorHandler` object, available with the `errorHandler` attribute.
-* decorate all requests with the `errorHandler` object, available with the `errorHandler` attribute; this can be used to construct a `buildContext` for mercurius resolvers, for example.
-* decorate the Fastify instance with a `hostname` attribute.
-
 ## Installation
 
 Install with npm:
@@ -23,26 +17,3 @@ pnpm add --filter "@scope/project @prefabs.tech/fastify-error-handler
 ```
 
 ## Usage
-
-import configPlugin from "@prefabs.tech/fastify-error-handler";
-import Fastify from "fastify";
-
-import config from "./config";
-
-const start = async () => {
-  // Create fastify instance
-  const fastify = Fastify({
-    logger: config.logger,
-  });
-
-  // Register fastify-error-handler plugin
-  await fastify.register(configPlugin, { config });
-
-  await fastify.listen({
-    port: config.port,
-    host: "0.0.0.0",
-  });
-};
-
-start();
-```