Add additional meta tags (for SEO)

[samwisekind]

References:

• https://github.com/joshbuchea/HEAD
• https://github.com/marcobiedermann/search-engine-optimization

Currently missing:

• Meta
  • [x] <meta http-equiv="x-ua-compatible" content="ie=edge">
  • [x] <meta name="subject" content="your website's subject">
• Link
  • [x] <link rel="archives" href="https://example.com/archives/">
  • [x] <link rel="index" href="https://example.com/">
  • [x] <link rel="first" href="https://example.com/atomFeed.php">
  • [x] <link rel="next" href="https://example.com/atomFeed.php?page=4">
  • [x] <link rel="prev" href="https://example.com/atomFeed.php?page=2">
  • [x] <link rel="last" href="https://example.com/atomFeed.php?page=147">
  • [x] <link rel="alternate" href="https://feeds.feedburner.com/example" type="application/rss+xml" title="RSS">
• [x] Favicons
• [x] Twitter Cards
• Apple iOS
  • [x] <link rel="apple-touch-icon" href="/path/to/apple-touch-icon.png">
• Apple Safari
  • [x] <link rel="mask-icon" href="/path/to/icon.svg" color="red">
• [x] Google Android
  • [x] <meta name="theme-color" content="#E64545">
• [x] Microsoft Internet Explorer

SEO Images:

• http://www.favicomatic.com/

After deployment:

• Meta
  • [ ] <meta name="google-site-verification" content="verification_token">
  • [ ] <meta name="msvalidate.01" content="verification_token">