feat(theme): 增加favicon配置

theme-terminal/templates/modules/layout.html

@@ -4,6 +4,7 @@
     <meta charset="UTF-8" />
     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link rel="icon" type="image/x-icon" th:href="${theme.config.basic.favicon}">
     <title th:text="${site.title}"></title>
     <link rel="stylesheet" th:href="@{/assets/dist/style.css?version=v1.0.1}" href="./assets/dist/style.css" />
   </head>