🎨 Palette: [UX improvement] Improve welcome page and documentation accessibility

[christopherfoxjr]

🎨 Palette: UX and Accessibility Improvements

💡 What

• Welcome Page Enhancements: Updated the embedded welcome.html in build.sh with descriptive emojis, improved keyboard focus indicators, and tactile :active state transforms.
• Documentation Refinement: Corrected recurring "Enviroment" typos and replaced the generic "image" alt text with a descriptive one in README.md.

🎯 Why

• Emojis: Improve visual scannability and anchor points for users.
• ARIA Labels: Ensure icon/emoji buttons are accessible to screen reader users.
• Focus/Active Styles: Provide necessary visual feedback for keyboard and mouse interactions.
• Typo Fixes: Maintain professional documentation quality.

♿ Accessibility

• Added aria-label to all primary buttons.
• Implemented high-contrast focus-visible outlines.
• Descriptive alt text for the main hero image.

📸 Before/After

(See attached screenshot in verification workflow)

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PR created automatically by Jules for task 11791914303292074101 started by @christopherfoxjr

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