Update and move JavaScript install code

Update the JavaScript dependency installation code to handle scoped
packages. The code is also updated to use pathlib's Path.

Move the JavaScript dependency installation to its own app named
dependencies.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/common/classes.py

@@ -281,7 +281,6 @@ class Template(object):
                 result.append(template.render(request=request))
             return result
 
-
     @classmethod
     def get(cls, name):
         return cls._registry[name]