🎨 Palette: Add ARIA live region to game score

[EiJackGH]

💡 What

Added aria-live="polite" and aria-atomic="true" to the #score element in src/views/mario-game.njk.
Also fixed a pip install blocking issue in requirements.txt by removing the un-installable venv module.

🎯 Why

When playing the game, the score updates dynamically. Screen readers need a way to announce this updating text without forcing the user to manually refocus the element. The aria-live region solves this by instructing the screen reader to quietly read out the updated score as it increments.

📸 Before/After

No visual changes.

♿ Accessibility

• Dynamic Content Announcement: The score is now announced by screen readers each time it increments, providing essential feedback to users relying on assistive technologies.

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PR created automatically by Jules for task 12747635575427490591 started by @EiJackGH

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