Follow code style standards

[AlexOreshkevich]

Adopt code style standards and eliminate code style issues mentioned in codacy: https://app.codacy.com/gh/rednavis/website/issues?&filters=W3siaWQiOiJMYW5ndWFnZSIsInZhbHVlcyI6W119LHsiaWQiOiJDYXRlZ29yeSIsInZhbHVlcyI6WyJDb2RlU3R5bGUiXX0seyJpZCI6IkxldmVsIiwidmFsdWVzIjpbXX0seyJpZCI6IlBhdHRlcm4iLCJ2YWx1ZXMiOltdfV0=

Please use Google JavaScript code style guide and mention it in README.MD
https://google.github.io/styleguide/jsguide.html