doc: change same repo links to relative paths

Changes the links to this repo in markdown files to relative paths,
which are supported by github. Also adds cordova-angularjs sample
to the index.

Author: jaimecbernardo

README.md

@@ -3,8 +3,9 @@
 This is a collection of samples showcasing the use of [Node.js on Mobile](https://github.com/janeasystems/nodejs-mobile).
 
 It contains the following samples:
-* Android: [Native Gradle Sample](https://github.com/janeasystems/nodejs-mobile-samples/tree/master/android/native-gradle)
-* Android: [Native Gradle Sample using a Node Project folder](https://github.com/janeasystems/nodejs-mobile-samples/tree/master/android/native-gradle-node-folder)
-* iOS: [Native Xcode Sample](https://github.com/janeasystems/nodejs-mobile-samples/tree/master/ios/native-xcode)
-* iOS: [Native Xcode Sample using a Node Project folder](https://github.com/janeasystems/nodejs-mobile-samples/tree/master/ios/native-xcode-node-folder)
-* React-Native: [Suspend Resume Sample](https://github.com/janeasystems/nodejs-mobile-samples/tree/master/react-native/SuspendResume)
+* Android: [Native Gradle Sample](android/native-gradle)
+* Android: [Native Gradle Sample using a Node Project folder](android/native-gradle-node-folder)
+* iOS: [Native Xcode Sample](ios/native-xcode)
+* iOS: [Native Xcode Sample using a Node Project folder](ios/native-xcode-node-folder)
+* React-Native: [Suspend Resume Sample](react-native/SuspendResume)
+* Cordova : [Cordova App With AngularJS](cordova-angularjs)

android/native-gradle-node-folder/README.md

@@ -18,7 +18,7 @@ The sample app runs the node.js engine in a background thread to start an HTTP s
 
 ## How the sample was developed
 
-This sample was built on top of the [`native-gradle` sample from this repo](https://github.com/janeasystems/nodejs-mobile-samples/tree/master/android/native-gradle), with the same functionality, but uses a `nodejs-project` folder that contains the node part of the project.
+This sample was built on top of the [`native-gradle` sample from this repo](../native-gradle), with the same functionality, but uses a `nodejs-project` folder that contains the node part of the project.
 
 ### Create the `nodejs-project` folder
 

ios/native-xcode-node-folder/README.md

@@ -21,7 +21,7 @@ To run the sample on iOS you need:
 
 ## How the sample was developed
 
-This sample was built on top of the [`native-xcode` sample from this repo](https://github.com/janeasystems/nodejs-mobile-samples/tree/master/ios/native-xcode), with the same functionality, but uses a `nodejs-project` folder that contains the node part of the project.
+This sample was built on top of the [`native-xcode` sample from this repo](../native-xcode), with the same functionality, but uses a `nodejs-project` folder that contains the node part of the project.
 
 ### Create the `nodejs-project` folder