revisions to job page: change name of arrow classes
- changing to move_up_arrow and move_down_arrow to reduce redundancy with other classes
replacing the remove_icon.png with FA glyph
work: replacing various carets with FA caret glyph
- new shared mixins to generate caret
- deprecating the previous mixin to create pure css mixins
- references replaced
revising to use FA 'remove' glyph instead of image