Card pictures

Traditional and Vintage (cards/*.webp)
  Byron Knoll's Vector Playing Cards, public domain
  (https://github.com/notpeter/Vector-Playing-Cards). The ace of spades and the
  two jester jokers are our own. Built by scripts/build_cards.py.

Atlas (cards/atlas/*.webp)
  "Atlasnye" deck for AisleRiot, (C) 2024 Vincent Bermel, GNU LGPL 3.0 or later
  (https://www.gnu.org/licenses/lgpl-3.0.html). Based on the Atlasnye playing
  cards by Dmitry Fomin (CC0), after the 1862 Russian deck by Adolf Charlemagne.
  Source: https://gitlab.gnome.org/GNOME/aisleriot/-/blob/51e1d770ceddfa7ee0fd775f7d59bbe4858ab87a/cards/atlasnye.svg

Modern (cards/modern/*.webp)
  "Neoclassical" deck for AisleRiot, (C) 2012 Charles Esquiaqui, (C) 2024
  Vincent Bermel, GNU LGPL 3.0 or later. Court cards and jokers based on "Free
  Vector Playing Cards Deck" by Charles Esquiaqui, CC BY 4.0
  (https://creativecommons.org/licenses/by/4.0/). Index font: Girassol (SIL OFL 1.1).
  Source: https://gitlab.gnome.org/GNOME/aisleriot/-/blob/51e1d770ceddfa7ee0fd775f7d59bbe4858ab87a/cards/neoclassical.svg

The Atlas and Modern pictures are the source decks rendered to WebP and resized
to 320 x 466 by scripts/build_card_styles.py; nothing else is changed.