doc: 增加主题色

Author: A5196060

src/BootstrapBlazor.Server/Components/App.razor

@@ -13,6 +13,7 @@
     <meta name="keywords" content="bootstrapblazor,bootstrap,blazor,wasm,webassembly,UI,netcore,web,assembly">
     <meta name="description" content="基于 Bootstrap 风格的 Blazor UI 组件库，用于研发企业级中后台产品。">
     <meta name="author" content="argo ([email protected])">
+    <meta name="theme-color" content="#712cf9">
     <title>@Localizer["SiteTitle"]</title>
     <base href="/" />
     <link rel="icon" href="favicon.ico" type="image/x-icon">