Join CSS from site and lessons

As per swcarpentry/lesson-template#140, but only the core CSS
changes.

-   Remove extra space before title of boxes
-   Remove background color of boxes when printing
-   Add "Input", "Output" and "Error" tips for code blocks
    when printing
-   Avoid duplicate lines

and "learning objectives" box.

The workshop template is mostly plain bootstrap, so getting it work
alongside the site CSS seems mostly straightforward. We only need to
add in a .workshop class to the body, and a .card class to the
.container in the workshop. Everything else is bootstrap content.

This commit also removes the banner.html include since this did not
seem to be removed in the main site, but was referenced in the CSS.
Removing it makes it clear the .banner class is only needed in the
workshop, not here.

* add Country drop down select
* add Gender

~~~
$ for file in $(grep -r -l 'bootcamp' .); do sed -i 's/bootcamp/workshop/g' $file; done
$ for file in $(grep -r -l 'boot camp' .); do sed -i 's/boot camp/workshop/g' $file; done
~~~

and others minors changes.

Close #240.

Rewriting novice shell lesson so that everything refers to Nelle instead of Vlad.

- Improve to handle err class
- Improve pandoc support

The CSS was add at our main CSS and remove from printing:

- Logo at header
- GitHub ribbon
- Footnote

Close #561.

Use h2 tag for "subtitle" will break any tool used to convert HTML
for another format. This commit replace h2 with span and rely on
CSS for have the same look.

Add GitHub Ribbon to our lessons

- For small screen, preserve margin.
- Use css-beautify

Backport of 9a19e91 from swcarpentry/site.

All credits to Abigail Cabunoc <abigail.cabunoc@oicr.on.ca>
for the awesome work with CSS.

* #462

* responsive for smaller screens
* move menu over more - click will always open menu
* #462

Add CSS media query to improve logo position

*   Indenting error output cells
*   Removing explicit 'level' keys from Markdown files
*   Storing the generated files so that people who don't use those tools won't have to regenerate them.
*   Modifying .gitignore to reflect this.
*   Updating the Makefile to run Jekyll exactly once.
*   Command to install on the server
*   No longer worrying about making a page of images
*   Better (more guessable) name for the target that builds the website
*   Fixing image paths
*   Fixing up glossary entries

* remove unused classes copied from google form
* moved styles to swc.css
* #361