Improve textures of card background, chips and dice (#52)

* Improve textures of card background, chips and dice

* Optimised images with calibre/image-actions

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: CodeDoctorDE

app/pack/textures/backgrounds/cards.png

@@ -1,6 +1,7 @@
 * Add snap support
 * Rename single player and multiplayer dialog
 * Remove browse tab
+* Improve textures of card background, chips and dice
 * Swamp board and figures in hand view
 * Redesign chess figures
 * Use minSdkVersion 24 instead of 23 (The minimum version of android is 7.0 (Nougat))