Reverting changes that were already there

CONTRIBUTING.md

@@ -9,40 +9,12 @@ This project adheres to the [Contributor Covenant Code of Conduct](http://contri
 The majority of contributions won't need to touch any Ruby code at
 all.
 
-## Installation how to
-
-You might want to get Linguist running in order to test locally whatever
-changes you might be doing to it. You will need to install some
-prerrequisite libraries
-first. [Install CMake](https://cmake.org/install/) which is required to install `rugged`.
-
-Then
-
-	bundle install
-
-to install all dependencies and finally
-
-	rake samples
-
-to generate `samples.json` file, which is needed for checking out
-samples. Then you can simply run
-
-	bundle exec linguist --breakdown
-
-to check the languages on the repository itself, or
-
-	bundle exec git-linguist --commit=362d300cb021f11fe1c66f69b7f1bb0c246f01b0 breakdown
-
-to get a breakdown in JSON format for an specific commit.
-
-You can try it too in some other directory this way:
-
-	bundle exec linguist ../../CPAN/Algorithm-Evolutionary
-
-
 ## Getting started
 
-Before you can start contributing to Linguist, you'll need to set up your environment first. Clone the repo and run `script/bootstrap` to install its dependencies.
+Before you can start contributing to Linguist, you'll need to set up
+your environment first. [Install CMake](https://cmake.org/install/)
+which is required to install `rugged` and then clone the repo and run
+`script/bootstrap` to install its dependencies. 
 
     git clone https://github.com/github/linguist.git
     cd linguist/