chore(project): move CONTRIBUTING to .github folder

.github/ISSUE_TEMPLATE.md

@@ -1,6 +1,6 @@
 <!--
 
-Make sure to checkout [CONTRIBUTING.md](https://github.com/bpmn-io/bpmn-js/blob/master/CONTRIBUTING.md#creating-an-issue) before filing a bug or feature request.
+Make sure to checkout [CONTRIBUTING.md](https://github.com/bpmn-io/bpmn-js/blob/master/.github/CONTRIBUTING.md#creating-an-issue) before filing a bug or feature request.
 
 If possible, reproduce bugs through a [JSFiddle snippet](https://jsfiddle.net/kxqy09gf) or in a separate project on GitHub.
 

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,7 +2,7 @@
 
 Thanks for filing a pull request!
 
-Make sure you've read through [our contributing guide](https://github.com/bpmn-io/bpmn-js/blob/master/CONTRIBUTING.md#creating-a-pull-request) before you continue.
+Make sure you've read through [our contributing guide](https://github.com/bpmn-io/bpmn-js/blob/master/.github/CONTRIBUTING.md#creating-an-issue) before you continue.
 
 -->
 

.npmignore

@@ -10,6 +10,4 @@ test/*
 .eslintignore
 .eslintrc
 .travis.yml
-.wiredeps
-CONTRIBUTING.md
 rollup.config.js

README.md

@@ -75,7 +75,7 @@ npm run all
 You may need to perform [additional project setup](./docs/project/SETUP.md) when
 building the latest development snapshot.
 
-Please checkout our [contributing guidelines](./CONTRIBUTING.md) if you plan to
+Please checkout our [contributing guidelines](./.github/CONTRIBUTING.md) if you plan to
 file an issue or pull request.