Merge branch 'link-to-recipies' into 'master'

Link To Recipies

People can't find the CentOS / RHEL guide. Now that it follows the official guide I think we can link to it.

doc/install/installation.md

@@ -10,9 +10,9 @@ If this is unclear check the [GitLab Blog](http://blog.gitlab.org/) for installa
 
 This guide is long because it covers many cases and includes all commands you need, this is [one of the few installation scripts that actually works out of the box](https://twitter.com/robinvdvleuten/status/424163226532986880).
 
-This installation guide was created for and tested on **Debian/Ubuntu** operating systems. Please read [doc/install/requirements.md](./requirements.md) for hardware and operating system requirements.
+This installation guide was created for and tested on **Debian/Ubuntu** operating systems. Please read [doc/install/requirements.md](./requirements.md) for hardware and operating system requirements. An unofficial guide for RHEL/CentOS can be found in the [GitLab recipes repository](https://gitlab.com/gitlab-org/gitlab-recipes/tree/master/install/centos).
 
-This is the official installation guide to set up a production server. To set up a **development installation** or for many other installation options please consult [the installation section in the readme](https://github.com/gitlabhq/gitlabhq#installation).
+This is the official installation guide to set up a production server. To set up a **development installation** or for many other installation options please see [the installation section of the readme](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/README.md#installation).
 
 The following steps have been known to work. Please **use caution when you deviate** from this guide. Make sure you don't violate any assumptions GitLab makes about its environment. For example many people run into permission problems because they changed the location of directories or run services as the wrong user.
 

doc/install/requirements.md

 # Operating Systems
 
-GitLab is developed for the Linux operating system.
+GitLab is developed for the Linux operating system. For the installations options and instructions please see [the installation section of the readme](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/README.md#installation).
 
 ## GitLab officially supports
 
@@ -13,13 +13,13 @@ GitLab is developed for the Linux operating system.
 - CentOS
 - Oracle Linux
 
-## Not officially supported
+## Not officially supported are
 
 - Arch Linux
 - Fedora
 - Gentoo
 
-On the above distributions it is pretty easy to install GitLab yourself.
+But on the above distributions it is pretty easy to install GitLab yourself.
 
 ## Unsupported Unix Systems
 
@@ -47,7 +47,7 @@ We love [JRuby](http://jruby.org/) and [Rubinius](http://rubini.us/)) but GitLab
 
 - 1 core works for under 100 users but the responsiveness might suffer
 - **2 cores** is the **recommended** number of cores and supports up to 100 users
-- 4 cores supports about 1,000 users
+- 4 cores supports up to 1,000 users
 - 8 cores supports up to 10,000 users
 
 ## Memory
@@ -70,11 +70,6 @@ Apart from a local hard drive you can also mount a volume that supports the netw
 
 If you have enough RAM memory and a recent CPU the speed of GitLab is mainly limited by hard drive seek times. Having a fast drive (7200 RPM and up) or a solid state drive (SSD) will improve the responsiveness of GitLab.
 
-# Installation troubles and reporting success or failure
-
-If you have troubles installing GitLab following the [official installation guide](installation.md)
-or want to share your experience installing GitLab on a not officially supported
-platform, please follow the the [contribution guide](/CONTRIBUTING.md).
 
 # Supported webbrowsers