Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time

Join the chat at

Build Status

This is the Jekyll source of the website.

How to Contribute?

You can contribute by reporting errors or suggesting improvements. Just open an issue or pull request.

This is a big project with many translations involved. Please help us stay on top of things by following our guidelines for contributors.

Get It!

Bundler will take care of the dependencies, so unless you already have done so, you might need to install bundler with:

gem install bundler

Then clone the repository and install the dependencies:

git clone
bundle install --without production

Make Changes

Making changes is easy: just locate the Markdown source of the page you want to improve, then make your changes or add content.

If you plan to submit a pull request or want to preview your changes on Heroku, you need to

  • create a topic branch,
  • commit your changes to this branch.

See the project's wiki for some guidelines on how your commits and PRs should look like.

Preview Your Changes

Preview Locally

Generate the website with

bundle exec rake build

Then start a local web server with

bundle exec rake serve

Open http://localhost:9292/ in your browser to access the preview.

Note: The build of the site will take several minutes.

Alternatively, you can use Jekyll directly.

bundle exec jekyll serve --watch --future --incremental

If your draft uses future date, you may want to use --future option.

Preview on Heroku

In case a build is not possible on your local machine or you want to test your changes under production conditions you can also create a preview on Heroku.

  • Sign up for Heroku if you do not have an account yet.

  • Install the Heroku Toolbelt.

  • Unless you already have, cd into your local working copy of this repo.

  • Create a preview app on Heroku using the custom buildpack:

    heroku login
    heroku create --buildpack
  • Push your feature branch:

    git push heroku feature_branch:master

    To create a preview of the master branch:

    git push heroku master

Open the preview in your browser with heroku open or retrieve the preview URL using heroku info and open it in your browser.


Besides generating and previewing the site you can perform additional tests with these tasks:

bundle exec rake lint          # run linter on markdown files
bundle exec rake check:markup  # check markup for all generated pages
bundle exec rake check:links   # check for 404's (needs a running local server)

More Information

For more information see the wiki.