add missing bracket

Upgrade bootstrap

Conflicts:
	css/swc-bootstrap.css
	css/swc.css

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.