Update to styles v9.5.2

* Add 'cp' (Carpentry) as a lesson type (for instructor training)
* Explain lesson type abbreviations (swc, dc, lc, cp)
* Emphasize the fact that there is no need to edit "repository" variable in front matter

update URLs to reflect consolidation to carpentries organization

Add links.md to files in boilerplate

Fix typo on jekyll install

Makefile: add docker-serve target

Move CODE_OF_CONDUCT.md to boilerplate

fix typo in explanation of keystroke explanationn

remove permalink that breaks asset includes

gitIgnore for R

fix typo

Closes swcarpentry/styles#283

`site.email` is used as:

_includes/lesson_footer.html:	        <a href="mailto:{{ site.email }}">Contact</a>
_includes/workshop_footer.html:	<a href="mailto:{{ site.email }}">Contact</a>

Therefore, it does not make sense to have `mailto` in the `email` itself.

Will also match https://raw.githubusercontent.com/swcarpentry/lesson-example/gh-pages/CONDUCT.md

Rename CoC file to align with GitHub's Community Profile expectation

See https://help.github.com/articles/about-community-profiles-for-public-repositories/.

Previous instructions fail due trying to use CRAN without setting a mirror.

Close swcarpentry/lesson-example#208

Add notes about style for emphasis and span of code

As suggested by @gcapes.