[readme] Update the documentation

Author: cryptogrot

README.md

@@ -6,7 +6,8 @@ This role will install and configure the mining tool `xmr-stak` on Linux operati
 
 * [Features](#features)
 * [Quickstart](#quickstart)
-  - [Requirements](#requirements)
+  - [Pre-requirements](#pre-requirements)
+  - [Deployment](#deployment)
   - [CPU backend](#cpu)
   - [NVIDIA backend](#nvidia) *(experimental)*
   - [AMD/ATI backend](#amd/ati) *(experimental)*
@@ -27,7 +28,7 @@ Supported algorithms:
 
 ## Quickstart
 
-### Requirements
+### Pre-requirements
 
 Ubuntu/Debian
 ```
@@ -42,6 +43,8 @@ CentOS 7
 $ sudo yum install python-pip -y
 ```
 
+### Deployment
+
 ```
 $ sudo pip install -U pip ansible
 $ mkdir -p ~/ansible/{inventories/xmr-stak,playbooks/xmr-stak,roles}

docs/ADVANCED.md

@@ -129,6 +129,8 @@ The role doesn't have any dependency, you could just run `ansible-galaxy install
 
 ## Make it run
 
+### Pre-requirements
+
 Few things to prepare before starting.
 Ubuntu/Debian
 ```
@@ -143,6 +145,8 @@ CentOS 7
 $ sudo yum install python-pip -y
 ```
 
+### Deployment
+
 ```
 $ sudo pip install -U pip ansible
 $ mkdir -p ~/ansible/{inventories/xmr-stak,playbooks/xmr-stak,roles}