Image placeholders

Image placeholders were loading before the widget get opened. Those placeholders may affect page load speed, so we changed the behavior of how they are loaded. Now, these placeholders will be loaded as the widget get opened.

Chrome 76 comes with its native lazyloading solution. It's a great convenience to handle image loading, so we also implemented it.

Also we added a email subscription status to the People section, so you can filter people by their subscription status.