message: add more meta tags
diff: <meta name="author" content="Rhys Gray">
  <meta name="image" content="https://github.com/ryceg/Eigengrau-s-Essential-Establishment-Generator/tree/master/src/Resources/example.png">
  <meta name="keywords" content="DnD, D&D, 5e, random generator, tavern generator, town generator, rpg tools">
  +<meta name="theme-color" content="#dedede">
  +<meta name="title" content="Eigengrau's Generator">
  +<meta name="generator" content="Twine">
  +<meta name="color-scheme" content="normal">
  +<meta name="robots" content="nofollow">
  +<meta name="application-name" content="Eigengrau's Generator">
  +<meta name="viewport" content="width=device-width, initial-scale=1.0">
  <!-- Polyfills for browser compatibility -->
  <script async src="https://unpkg.com/core-js-bundle@3.0.1/minified.js"></script>
  