Improve website cascading grid layout rendering and jittering

Remove Masonry cascading grid layout library in order to improve website cascading grid layout rendering and jittering.

As suggestion we can use similar CSS-base solution. A good compromise is use `column-count` and `column-gap` CSS columns that have pretty decent supported on modern browsers. For IE9 and lower we provide a fallback plan.

For more compatibility information see, http://www.quirksmode.org/css/columns.