Add charset tag for UTF-8

layouts/partials/header.html

@@ -5,6 +5,7 @@
     {{ .Hugo.Generator }}
     {{ "<!-- Tumble theme for Hugo: https://github.com/adrianshort/tumble -->" | safeHTML }}
     <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta charset="utf-8">
     <link rel="stylesheet" href="{{ relURL "/css/main.css" }}">
     
     <!-- https://www.bootstrapcdn.com/fontawesome/ -->