Rewrite getting_started guide from HAML to Markdown

Signed-off-by: Takuya Noguchi <[email protected]>

source/guides/getting_started.html.md

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+---
+title: Getting Started
+---
+## What is Bundler?
+
+Bundler provides a consistent environment for Ruby projects by tracking
+and installing the exact gems and versions that are needed.
+
+Bundler is an exit from dependency hell, and ensures that the gems
+you need are present in development, staging, and production.
+Starting work on a project is as simple as `bundle install`.
+
+<a href="../whats_new.html" class="btn btn-primary">What's new in Bundler</a>
+<a href="./rationale.html" class="btn btn-primary">Why Bundler exists</a>
+
+## Getting Started
+<a name="getting-started"></a>
+
+This guide assumes that you have both [Ruby](https://www.ruby-lang.org/en/downloads/)
+and [RubyGems](https://rubygems.org/pages/download) installed. If you do not have Ruby
+and RubyGems installed, do that first and then check back here!
+
+Getting started with bundler is easy!
+Specify your dependencies in a Gemfile in your project's root:
+
+~~~ruby
+source 'https://rubygems.org'
+gem 'nokogiri'
+gem 'rack](~> 2.2.4'
+gem 'rspec'
+~~~
+
+<a href="./gemfile.html" class="btn btn-primary">Learn More: Gemfiles</a>
+
+Install all of the required gems from your specified sources:
+~~~
+$ bundle install
+$ git add Gemfile Gemfile.lock
+~~~
+
+<a href="../man/bundle-install.1.html" class="btn btn-primary">Learn More: bundle install</a>
+
+The second command adds the Gemfile and Gemfile.lock to your repository. This ensures
+that other developers on your app, as well as your deployment environment, will all use
+the same third-party code that you are using now.
+
+Inside your app, load up the bundled environment:
+
+~~~ruby
+require 'rubygems'
+require 'bundler/setup'
+# require your gems as usual
+require 'nokogiri'
+~~~
+
+<a href="./bundler_setup.html" class="btn btn-primary">Learn More: Bundler.setup</a>
+
+Run an executable that comes with a gem in your bundle:
+
+~~~
+$ bundle exec rspec spec/models
+~~~
+
+In some cases, running executables without `bundle exec`
+may work, if the executable happens to be installed in your system
+and does not pull in any gems that conflict with your bundle.
+
+However, this is unreliable and is the source of considerable pain.
+Even if it looks like it works, it may not work in the future or
+on another machine.
+
+Finally, if you want a way to get a shortcut to gems in your bundle:
+
+~~~
+$ bundle install --binstubs
+$ bin/rspec spec/models
+~~~
+
+The executables installed into `bin` are scoped to the
+bundle, and will always work.
+
+<a href="../man/bundle-exec.1.html" class="btn btn-primary">Learn More: Executables</a>
+
+## Create a rubygem with Bundler
+<a name="create-gem"></a>
+
+Bundler is also an easy way to create new gems. Just like you might create a standard Rails project using `rails new`, you can create a standard gem project with `bundle gem`.
+
+Create a new gem with a README, .gemspec, Rakefile, directory structure, and all the basic boilerplate you need to describe, test, and publish a gem:
+
+~~~
+$ bundle gem my_gem
+Creating gem 'my_gem'...
+create  my_gem/Gemfile
+create  my_gem/.gitignore
+create  my_gem/lib/my_gem.rb
+create  my_gem/lib/my_gem/version.rb
+create  my_gem/my_gem.gemspec
+create  my_gem/Rakefile
+create  my_gem/README.md
+create  my_gem/bin/console
+create  my_gem/bin/setup
+create  my_gem/CODE_OF_CONDUCT.md
+create  my_gem/LICENSE.txt
+create  my_gem/.travis.yml
+create  my_gem/test/test_helper.rb
+create  my_gem/test/my_gem_test.rb
+Initializing git repo in ./my_gem
+~~~
+
+<a href="../man/bundle-gem.1.html" class="btn btn-primary">Learn More: bundle gem</a>
+
+## Use Bundler with
+<a name="use-bundler"></a>
+
+<a href="./rails.html" class="btn btn-primary">Rails</a>
+<a href="./sinatra.html" class="btn btn-primary">Sinatra</a>
+<a href="./rubygems.html" class="btn btn-primary">RubyGems</a>
+<a href="./rubymotion.html" class="btn btn-primary">RubyMotion</a>
+
+## Get involved
+<a name="get-involved"></a>
+
+Bundler has a lot of contributors and users, and they all talk to each other quite a bit.
+If you have questions, try [the IRC channel](http://webchat.freenode.net/?channels=bundler)
+or [mailing list](http://groups.google.com/group/ruby-bundler).
+If you're interested in contributing to the project (no programming skills needed),
+read [the contributing guide](https://github.com/rubygems/rubygems/blob/master/bundler/doc/contributing/README.md)
+or [the development guide](https://github.com/rubygems/rubygems/blob/master/bundler/doc/development/README.md).
+While participating in the Bundler project, please keep the [code of conduct](/conduct.html)
+in mind, and be inclusive and friendly towards everyone. If you have sponsorship or security questions, please contact the core team directly.
+
+<a href="/conduct.html" class="btn btn-primary">Code of Conduct</a>
+<a href="http://webchat.freenode.net/?channels=bundler" class="btn btn-primary">#bundler on IRC</a>
+<a href="http://groups.google.com/group/ruby-bundler" class="btn btn-primary">Mailing list</a>
+<a href="https://github.com/rubygems/rubygems/blob/master/bundler/doc/contributing/README.md" class="btn btn-primary">Contributing</a>
+<a href="mailto:[email protected]" class="btn btn-primary">Email core team</a>