fix: remove outdated links

README.md

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 > ### Angular codebase containing real world examples (CRUD, auth, advanced patterns, etc) that adheres to the [RealWorld](https://github.com/gothinkster/realworld-example-apps) spec and API.
 
-<a href="https://stackblitz.com/edit/angular-realworld" target="_blank"><img width="187" src="https://github.com/gothinkster/realworld/blob/master/media/edit_on_blitz.png?raw=true" /></a>&nbsp;&nbsp;<a href="https://thinkster.io/tutorials/building-real-world-angular-2-apps" target="_blank"><img width="384" src="https://raw.githubusercontent.com/gothinkster/realworld/master/media/learn-btn-hr.png" /></a>
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 ### [Demo](https://angular.realworld.io)&nbsp;&nbsp;&nbsp;&nbsp;[RealWorld](https://github.com/gothinkster/realworld)
 
 This codebase was created to demonstrate a fully fledged application built with Angular that interacts with an actual backend server including CRUD operations, authentication, routing, pagination, and more. We've gone to great lengths to adhere to the [Angular Styleguide](https://angular.io/styleguide) & best practices.