Add meta description option to my pages

_layouts/default.html

@@ -7,6 +7,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="author" content="Tait Hoyem">
     <meta name="keywords" content="{{ page.keywords }}">
+    <meta name="description" content="{{ page.description }}">
     {%- if page.math -%}
     <link rel="stylesheet" href="/assets/css/katex.css">
     {% endif %}