updated welcome.tsx

[rohiitgit]

welcome screen now shows only 3 screens:

  {
    title: "Welcome to Open Blood",
    content: "The smartest way to donate blood and save lives in your community.",
    emoji: "🩸"
  },
  {
    title: "Everything you need",
    content: "• Quick 2-minute registration\n• Get notified when blood is needed\n• Track your donation history\n• Emergency alerts in your area",
    emoji: "✨"
  },
  {
    title: "Your privacy matters",
    content: "Your data is encrypted and secure. You control who sees what. No selling, no spam, just helping save lives.",
    emoji: "🔒"
  }
]```

 and fixed some minor ui issues.