Add head tag and fix css for ios browser

[waku25]

Fixed Issue

• Button color is wrong when viewed in iOS browser

Modified Source

• Add head tag
  • Add meta tag
  • twitter cards
  • open graph
  • allow robots
• Fix css
  • font color of button
  • night mode color

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Name	Status	Preview	Updated (UTC)
omutatsu-button	✅ Ready (Inspect)	Visit Preview	Feb 17, 2024 3:03pm