Remove section about skipping non API route from README

Looking for a closer integrated solution in #350

Author: ahx

README.md

@@ -350,50 +350,7 @@ Here your OpenAPI schema defines endpoints starting with `/resource` but your ac
 oad = OpenapiFirst.load('openapi.yaml') do |config|
   config.path = ->(req) { request.path.delete_prefix('/api') }
 end
-# Add your custom middleware
 use OpenapiFirst::Middlewares::RequestValidation, oad
-
-# You can add ResponseValidation without any customization.
-use OpenapiFirst::Middlewares::ResponseValidation, 'openapi.yaml'
-```
-
-In this case, you might want to serve APIs on `/api` while serving rendered pages on other paths which are not managed by OpenAPI schema in a single application.
-
-You can add some lines to selectively validate only paths under `/api` while bypassing others:
-
-```diff
-    env[OpenapiFirst::PATH] = request.path.to_s.sub(%r"^/api", "")
-
-+    # Only validate paths under /api/
-+    if request.path.start_with?('/api/')
-       super
-+    else
-+      @app.call(env)
-+    end
-   end
-```
-
-And the final code is:
-
-```ruby
-class CustomOpenAPIValidation < OpenapiFirst::Middlewares::RequestValidation
-  def call(env)
-    request = Rack::Request.new(env)
-
-    # Strip the "/api" prefix for schema matching
-    env[OpenapiFirst::PATH] = request.path.to_s.sub(%r"^/api", "")
-
-    # Only validate paths under /api/
-    if request.path.start_with?('/api/')
-      super
-    else
-      @app.call(env)
-    end
-  end
-end
-
-use CustomOpenAPIValidation, 'openapi.yaml'
-use OpenapiFirst::Middlewares::ResponseValidation, 'openapi.yaml'
 ```
 
 ## Development