[Documents] Thumbnails Showcase

[brusch]

@dvesh3 @fashxp

Here's the thumbnail config for this effect:

        "items" => [
            [
                "method" => "scaleByWidth",
                "arguments" => [
                    "width" => 870,
                    "forceResize" => FALSE
                ]
            ],
            [
                "method" => "brightnessSaturation",
                "arguments" => [
                    "brightness" => 100,
                    "saturation" => 70,
                    "hue" => 100
                ]
            ],
            [
                "method" => "addOverlayFit",
                "arguments" => [
                    "path" => "/web/static/img/color-overlay.png",
                    "composite" => "COMPOSITE_DEFAULT"
                ]
            ]
        ],
        "medias" => [

        ],
        "name" => "content",
        "description" => "",
        "group" => "",
        "format" => "SOURCE",
        "quality" => 95,
        "highResolution" => 0.0,
        "preserveColor" => FALSE,
        "preserveMetaData" => FALSE,
        "rasterizeSVG" => FALSE,
        "downloadable" => FALSE,
        "modificationDate" => 1564472229,
        "creationDate" => 1564471631,
        "id" => "content"
    ],

That's the overlay image used: