BHV-10659: Contextual Popup Issues/Replace nub images with CSS3 shapes Enyo-DCO-1.1-Signed-off-by: Brooke Peterson <brooke.peterson@lge.com>
further refractor code to simplify the final output of CSS, also added .high .low classes rule which was missed in the first commit
minor tweaking of the code and reformat
change back package js to dark theme
Optimizations to the CSS, make it a little easier to manage the logic.
Minor spacing/formatting adjustments.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>
Merge pull request #1390 from enyojs/BHV-10659-brookepeterson

BHV-10659: Replace ContextualPopupNub with pure CSS