Replace bootcamp with workshop

~~~
$ 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.

swc.css

@@ -256,25 +256,25 @@ table.outlined {
     border-collapse: collapse;
 }
 
-/* Container for content in the bootcamp index page */
-div.bootcamps {
+/* Container for content in the workshop index page */
+div.workshops {
     text-align: center;
 }
 
-/* Link items (to bootcamp pages) in the bootcamps tables */
-table.bootcamps td.link {
+/* Link items (to workshop pages) in the workshops tables */
+table.workshops td.link {
     width: 50%;
     text-align: left;
 }
 
-/* Spacer items (i.e. ellipsis) on the bootcamps tables */
-table.bootcamps td.spacer {
+/* Spacer items (i.e. ellipsis) on the workshops tables */
+table.workshops td.spacer {
    max-width: 100%;
    text-align: center;
 }
 
-/* Date columns on the bootcamps tables */
-table.bootcamps td.date {
+/* Date columns on the workshops tables */
+table.workshops td.date {
     width: 50%;
     text-align: right;
 }