task: restructure the frontend to the interim(pre-release) structure

[alex-milanov]

public
/css <- all css and sass files
/img <- all image files
/views <- all template files, template structure follow the state/routes structure
/controllers <- global(not part of a specific module) controllers
/directives <- global directives
/services <- global services
/modules <- only javascript files
/users
/controllers
... - directives and services
app.js <- config and all routes/states