Fix links that 404 or redirect

http://electron.atom.io/docs/tutorial/quick-start/ -> Replaces links that were 404ing
http://electron.atom.io/docs/ -> Replaces a link that was redirecting via 301

README.md

@@ -2,7 +2,7 @@
 
 **Clone and run for a quick way to see Electron in action.**
 
-This is a minimal Electron application based on the [Quick Start Guide](http://electron.atom.io/docs/latest/tutorial/quick-start) within the Electron documentation.
+This is a minimal Electron application based on the [Quick Start Guide](http://electron.atom.io/docs/tutorial/quick-start/) within the Electron documentation.
 
 **Use this app along with the [Electron API Demos](http://electron.atom.io/#get-started) app for API code examples to help you get started.**
 
@@ -12,7 +12,7 @@ A basic Electron application needs just these files:
 - `main.js` - Starts the app and creates a browser window to render HTML. This is the app's **main process**.
 - `index.html` - A web page to render. This is the app's **renderer process**.
 
-You can learn more about each of these components within the [Quick Start Guide](http://electron.atom.io/docs/latest/tutorial/quick-start).
+You can learn more about each of these components within the [Quick Start Guide](http://electron.atom.io/docs/tutorial/quick-start/).
 
 ## To Use
 
@@ -29,7 +29,7 @@ npm install
 npm start
 ```
 
-Learn more about Electron and its API in the [documentation](http://electron.atom.io/docs/latest).
+Learn more about Electron and its API in the [documentation](http://electron.atom.io/docs/).
 
 ## Other Example Apps