message: Correct <head lang="en"> to <html lang="en"> for a11y reasons, and to not be evil.
diff: <!DOCTYPE html>
  -<html>
  -<head lang="en">
  +<html lang="en">
  +<head>
  <meta charset="UTF-8">
  <title>{{ page.title }}</title>
  <link rel="stylesheet" href="{{ site.baseurl }}/css/normalize.css">
  