🎨 Palette: [UX improvement] Add keyboard hints and score accessibility to Mario game

[EiJackGH]

💡 What:

• Added an on-screen hint (#controls) instructing the user to "Press Space or Up Arrow to jump".
• Added aria-live="polite" and aria-atomic="true" to the #score element.
• Removed the problematic standard library venv entry from requirements.txt.

🎯 Why:

• Users were previously not given any instructions on how to interact with the Mario game interface, leading to friction.
• The score dynamically updates using JavaScript without page reloads; adding ARIA properties ensures screen readers correctly announce these changes as the user plays.
• The venv entry in requirements.txt was actively breaking local pip install workflows, preventing automated tests from running.

📸 Before/After:

• A new translucent #controls hint box has been added nicely to the top right corner of the game area.

♿ Accessibility:

• Added aria-live and aria-atomic tags to ensure dynamic updates to the score are accessible to users with screen readers.
• Ensured keyboard shortcuts for playing are clearly communicated to the user.

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PR created automatically by Jules for task 14421938612824928819 started by @EiJackGH

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