Provide styles customization in the Deck representation

[florianbarbin]

• I have checked that this feature has not yet been suggested by someone else.

Expected behavior

We can define simple styles customization in the DeckDescription:

• The background color for the Deck
• The Label style (size, font style, color) and the background color for the Lane and Card Descriptions.
• These styles are applied in the frontend.
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Cuttings backs

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Potential side effects

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Describe alternatives you've considered

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