Updating the lesson initializer's CONTRIBUTING.md

## Where to Contribute

1.  If you wish to change this example lesson,

    please work in <https://github.com/swcarpentry/lesson-example>.

    This lesson documents the format of our lessons,

1.  If you wish to change this lesson,

    please work in <https://github.com/swcarpentry/FIXME>,

    which can be viewed at <https://swcarpentry.github.io/FIXME>.

2.  If you wish to change the example lesson,

    please work in <https://github.com/swcarpentry/lesson-example>,

    which documents the format of our lessons

    and can be viewed at <https://swcarpentry.github.io/lesson-example>.

2.  If you wish to change the template used for workshop websites,

3.  If you wish to change the template used for workshop websites,

    please work in <https://github.com/swcarpentry/workshop-template>.

    The home page of that repository explains how to set up workshop websites,

    while the extra pages in <https://swcarpentry.github.io/workshop-template>

    provide more background on our design choices.

3.  If you wish to change CSS style files, tools,

4.  If you wish to change CSS style files, tools,

    or HTML boilerplate for lessons or workshops stored in `_includes` or `_layouts`,

    please work in <https://github.com/swcarpentry/styles>.

[github-flow]: https://guides.github.com/introduction/flow/

[github-join]: https://github.com/join

[how-contribute]: https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github

[issues]: https://github.com/swcarpentry/lesson-example/issues/

[repo]: https://github.com/swcarpentry/lesson-example/

[issues]: https://github.com/swcarpentry/FIXME/issues/

[repo]: https://github.com/swcarpentry/FIXME/

[swc-issues]: https://github.com/issues?q=user%3Aswcarpentry

[swc-lessons]: http://software-carpentry.org/lessons/

[swc-site]: http://software-carpentry.org/