Merge pull request swcarpentry#303 from katrinleinweber/patch-3

links.md: add links to carpentries' lessons overview pages

_includes/links.md

@@ -9,6 +9,7 @@
 [cran-checkpoint]: https://cran.r-project.org/package=checkpoint
 [cran-knitr]: https://cran.r-project.org/package=knitr
 [cran-stringr]: https://cran.r-project.org/package=stringr
+[dc-lessons]: http://www.datacarpentry.org/lessons/
 [email]: mailto:team@carpentries.org
 [github-importer]: https://import.github.com/
 [importer]: https://github.com/new/import
@@ -17,6 +18,7 @@
 [jekyll-windows]: http://jekyll-windows.juthilo.com/
 [jekyll]: https://jekyllrb.com/
 [jupyter]: https://jupyter.org/
+[lc-lessons]: https://librarycarpentry.org/#portfolio
 [lesson-example]: https://carpentries.github.io/lesson-example/
 [mit-license]: https://opensource.org/licenses/mit-license.html
 [morea]: https://morea-framework.github.io/
@@ -32,6 +34,7 @@
 [ruby-installer]: https://rubyinstaller.org/
 [rubygems]: https://rubygems.org/pages/download/
 [styles]: https://github.com/carpentries/styles/
+[swc-lessons]: https://software-carpentry.org/lessons/ 
 [swc-releases]: https://github.com/swcarpentry/swc-releases
 [workshop-repo]: {{ site.workshop_repo }}
 [yaml]: http://yaml.org/