Serpinksy "gallery" image --> show three sub-images

[MatthewPeterKelly]

Update the Serkpinksy gallery image to show a smaller version of three fractals, rather than one big one.

[MatthewPeterKelly]

Triangle:

{
  "Serpinsky": {
    "fit_image": {
      "resolution": [300, 300],
      "padding_scale": 1.1
    },
    "sample_count": 20000000,
    "rng_seed": 12345,
    "subpixel_antialiasing": 4,
    "background_color_rgb": [14, 14, 14],
    "vertex_colors_rgb": [
      [52, 152, 219],
      [46, 204, 113],
      [231, 76, 60]
    ]
  }
}

[MatthewPeterKelly]

Pentagon

{
  "Serpinsky": {
    "fit_image": {
      "resolution": [300, 300],
      "padding_scale": 1.1
    },
    "sample_count": 20000000,
    "rng_seed": 12345,
    "subpixel_antialiasing": 4,
    "background_color_rgb": [14, 14, 14],
    "vertex_colors_rgb": [
      [52, 152, 219],
      [46, 204, 113],
      [241, 196, 15],
      [231, 76, 60],
      [155, 89, 182]
    ]
  }
}

[MatthewPeterKelly]

Hexagon

{
  "Serpinsky": {
    "fit_image": {
      "resolution": [300, 300],
      "padding_scale": 1.1
    },
    "sample_count": 20000000,
    "rng_seed": 12345,
    "subpixel_antialiasing": 4,
    "background_color_rgb": [14, 14, 14],
    "vertex_colors_rgb": [
      [52, 152, 219],
      [39, 174, 96],
      [241, 196, 15],
      [230, 126, 34],
      [231, 76, 60],
      [155, 89, 182]
    ]
  }
}

[MatthewPeterKelly]

Combining all three into a single composite image: