Remove refactoringGuru urls from main README.

Author: ilopX

README.md

@@ -4,31 +4,31 @@ It contains **Dart** examples for all classic **GoF** design patterns.
 
 # Implementation checklist:
 - [ ] **Creation**
-    - [ ] [**Abstract Factory**](https://refactoring.guru/design-patterns/abstract-factory)
-    - [x] [**Builder**](https://refactoring.guru/design-patterns/builder) - [[Color Text Format](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/builder/color_text_format)]
-    - [ ] [**Factory Method**](https://refactoring.guru/design-patterns/factory-method)
-    - [x] [**Prototype**](https://refactoring.guru/design-patterns/prototype) - [[Shapes](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/prototype/shapes)] 
-    - [ ] [**Singleton**](https://refactoring.guru/design-patterns/singleton)
+    - [ ] **Abstract Factory**
+    - [x] **Builder** - [[Color Text Format](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/builder/color_text_format)]
+    - [ ] **Factory Method**
+    - [x] **Prototype**] - [[Shapes](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/prototype/shapes)] 
+    - [ ] **Singleton**
 - [ ]  **Behavioral**
-    - [x] [**Chain of Responsibility**](https://refactoring.guru/design-patterns/chain-of-esponsibility) - [[Server Middleware](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/chain_of_responsibility/server_middleware)]
-    - [x] [**Command**](https://refactoring.guru/design-patterns/command) - [[Text Editor](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/command/text_editor)] 
+    - [x] **Chain of Responsibility** - [[Server Middleware](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/chain_of_responsibility/server_middleware)]
+    - [x] **Command** - [[Text Editor](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/command/text_editor)] 
     - [ ] Interpreter
-    - [ ] [**Iterator**](https://refactoring.guru/design-patterns/iterator)
-    - [ ] [**Mediator**](https://refactoring.guru/design-patterns/mediator)
-    - [x] [**Memento**](https://refactoring.guru/design-patterns/memento) - [[Conceptual](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/memento/conceptual)]
-    - [x] [**Observer**](https://refactoring.guru/design-patterns/observer) - [[Open-Close Editor Events](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/observer/open_close_editor_events)] [[AppObserver](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/observer/app_observer)] [[Subscriber Flutter Widget](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/observer/subscriber_flutter_widget)]
-    - [ ] [**State**](https://refactoring.guru/design-patterns/state)
-    - [ ] [**Template Method**](https://refactoring.guru/design-patterns/template-method)
-    - [ ] [**Visitor**](https://refactoring.guru/design-patterns/visitor)
-    - [ ] [**Strategy**](https://refactoring.guru/design-patterns/strategy)
+    - [ ] **Iterator**
+    - [ ] **Mediator**
+    - [x] **Memento** - [[Conceptual](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/memento/conceptual)]
+    - [x] **Observer** - [[Open-Close Editor Events](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/observer/open_close_editor_events)] [[AppObserver](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/observer/app_observer)] [[Subscriber Flutter Widget](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/observer/subscriber_flutter_widget)]
+    - [ ] **State**
+    - [ ] **Template Method**
+    - [ ] **Visitor**
+    - [ ] **Strategy**
 - [ ] **Structural**
-    - [x] [**Adapter**](https://refactoring.guru/design-patterns/adapter) - [[Text Graphics](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/adapter/text_graphics)] [[Square Round conflict](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/adapter/square_round_conflict)] [[Flutter Adapter](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/adapter/flutter_adapter)] 
-    - [x] [**Bridge**](https://refactoring.guru/design-patterns/bridge) - [[Remote Device Control](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/bridge/devices_remote_control)] [[Clock](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/bridge/clock)] 
-    - [x] [**Composite**](https://refactoring.guru/design-patterns/composite) - [[Image Editor](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/composite/image_editor)] [[Products and Boxes](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/composite/products_and_boxes)] 
-    - [x] [**Decorator**](https://refactoring.guru/design-patterns/decorator) - [[Data Source Decoder](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/decorator/data_source_decoder)]
-    - [ ] [**Facade**](https://refactoring.guru/design-patterns/facade)
-    - [ ] [**Flyweight**](https://refactoring.guru/design-patterns/flyweight)
-    - [ ] [**Proxy**](https://refactoring.guru/design-patterns/proxy)
+    - [x] **Adapter** - [[Text Graphics](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/adapter/text_graphics)] [[Square Round conflict](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/adapter/square_round_conflict)] [[Flutter Adapter](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/adapter/flutter_adapter)] 
+    - [x] **Bridge** - [[Remote Device Control](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/bridge/devices_remote_control)] [[Clock](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/bridge/clock)] 
+    - [x] **Composite** - [[Image Editor](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/composite/image_editor)] [[Products and Boxes](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/composite/products_and_boxes)] 
+    - [x] **Decorator** - [[Data Source Decoder](https://github.com/RefactoringGuru/design-patterns-dart/tree/master/patterns/decorator/data_source_decoder)]
+    - [ ] **Facade**
+    - [ ] **Flyweight**
+    - [ ] **Proxy**
 
 ## Requirements
 
@@ -69,7 +69,7 @@ flutter build web -t bin\main.dart --web-renderer html
 ```
 
 ### Deploy flutter demos
-1. Fork this repo: https://github.com/RefactoringGuru/design-patterns-dart
+1. Fork this repo: `https://github.com/RefactoringGuru/design-patterns-dart`
 2. Apply your changes.
 3. Run the script `dart bin\deploy_flutter_demos.dart`.
 This script will build a web platform flutter app and push the changes to your **web-demos** branch on github.