style: 增加追悼样式

Author: ArgoZhang

src/BootstrapBlazor/wwwroot/scss/root.scss

@@ -120,7 +120,7 @@ a, a:hover, a:focus {
     }
 }
 
-[data-bs-theme='memorial'] {
+[data-bb-theme='memorial'] {
     &:root {
         --bs-body-bg: #000;
         --bs-body-color: #b5b5c3;