update docs

Author: abdumu

docs/1_introduction.md

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 # Introduction
 
 It's a tool to help ease the repetitive migration process during developing a Laravel project without migrate:fresh your database every time you change you schemas.

docs/2_installation.md

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 # Installation
 
 To get started, use Composer to add the package to your project's dependencies:
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 </p>
 
 <p align="right">
-  Next:  <a href="4_quick-start.md">Quick start ></a> 
+  Next:  <a href="3_quick-start.md">Quick start ></a> 
 </p>