doc(readme): update Readme to clean obsolete sections

README.md

@@ -12,14 +12,10 @@ If you want the helper to react to add/removals, you should be using some versio
 
 In any case, this addon should be compatible with basically every ember version from 3.28 to 5.x.
 
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 Ember template helper allowing to test if an array contains a particular element.
 
@@ -30,21 +26,10 @@ Ember template helper allowing to test if an array contains a particular element
 This helper allows to test the presence of a literal, a full object or a specific property/value of
 an object inside a given array. Objects can be native or Ember objects.
 
-## Documentation
-
-The documentation is available [here](http://baptiste.meurant.io/ember-array-contains-helper/docs).
-
-## Samples & Demo
-
-- A dummy demo application containing syntax samples runs [here](http://baptiste.meurant.io/ember-array-contains-helper/)
-- The source code of this demo can be found [here](https://github.com/bmeurant/ember-array-contains-helper/blob/master/tests/dummy/app/templates/application.hbs)
-
 ## Compatibility
 
 - This helper is tested against Ember 3.28+
 
-See travis CI build and report [here](https://travis-ci.org/bmeurant/ember-array-contains-helper) for current tests and compatibility details.
-
 ## Troubleshooting
 
 Before its version 2.x, this addon came with a polyfill (`ember-runtime-enumerable-includes-polyfill`) emulating the native EcmaScript method `includes` in case you wanted to run it within an environment that did not support this method.
@@ -187,23 +172,6 @@ export default class ApplicationRoute extends Route {
 It could eventually break some apps relying on the initial behaviour but it has been considered as a fix since the first behaviour
 was accidental. See [this issue](https://github.com/emberjs/ember.js/issues/14016) for details.
 
-## Changelog
-
-Changelog can be found [here](https://github.com/bmeurant/ember-array-contains-helper/blob/master/CHANGELOG.md)
-
-## Contributing
-
-Thank you!!!
-
-- Open an Issue for discussion first if you're unsure a feature/fix is wanted.
-- Branch off of `master` (Use descriptive branch names)
-- Follow [DockYard Ember.js Style Guide](https://github.com/DockYard/styleguides/blob/master/engineering/ember.md)
-- if needed, add or update documentation following [YUIDoc syntax](http://yui.github.io/yuidoc/syntax/)
-- Test your features / fixes
-- Use [Angular-Style Commits](https://github.com/angular/angular.js/blob/v1.4.8/CONTRIBUTING.md#-submission-guidelines). Use correct type, short subject and motivated body.
-- PR against `master`
-- Linting & tests must pass, coverage and codeclimate should be preserved
-
 ## Development
 
 ### Installation