Merge branch 'master' of https://github.com/jp7internet/react-apz.wiki
Fix demonstration app URL
Updated Create React App (markdown)
Fix yarn add dev dependencies lines
Add Git versioning to steps and substitute npm with yarn
Update guide to use the latest version of React Router
Updated _Sidebar (markdown)
Updated Step by Step (markdown)
Create ordered sidebar
Fix guide to teach how to proxy requests instead of implementing CORS to the back-end server
Add fix to edit method
Fix /contacts/:id method
Add a new GET route to fetch a contact by ID
Fix manager repo name
Change repo owner name to jp7internet
Updated Integrate the back end server to the React app (markdown)
Fix integration step where ContactList refactoring part was missing from tutorial
Updated Create a back end server and database (markdown)
Fix action names to be uppercase