Delete : unnecessary files and cleaning

Author: jeromedcpaymium

.gitignore

@@ -1,28 +1,4 @@
 # Paymium OpenAPI Specification
-[![Build Status](https://travis-ci.org/paymium/api-documentation.svg?branch=master)](https://travis-ci.org/paymium/api-documentation)
 
-## Links
+[documentation v1](https://paymium.github.io/api-documentation/)
 
-- [Reference Documentation (ReDoc)](https://paymium.github.io/api-documentation/)
-- OpenAPI Raw Files: [JSON](https://paymium.github.io/api-documentation/openapi.json) [YAML](https://paymium.github.io/api-documentation/openapi.yaml)
-- [Old API documentation](https://github.com/Paymium/old-api-documentation)
-
-## Working on specification
-### Install
-
-1. Install [Node JS](https://nodejs.org/)
-2. Clone repo and run `npm install` in the repo root
-
-### Usage
-
-#### `npm start`
-Starts the development server.
-
-#### `npm run build`
-Bundles the spec and prepares web_deploy folder with static assets.
-
-#### `npm test`
-Validates the spec.
-
-#### `npm run gh-pages`
-Deploys docs to GitHub Pages. You don't need to run it manually if you have Travis CI configured.