Remove duplicated instructions

[hramos]

No description provided.

[flovilmart]

👍

[flovilmart]

@hramos I just realized we don't say:
We should have an section like:

Installation

As a standalone server:

run : $ npm install -g parse-server

Now parse-server is installed on your system,
to start:

parse-server --appId YOUR_APP_ID --masterKey YOUR_MASTER_KEY

As an express module

If you already have a web server running on express.js, you can add parse-server to it:

in your web server project:

$ npm install --save parse-server
update your main app:

var ParseServer = require('parse-server');
app.use('/parse', new ParseServer(config));