fix: the mathjax missing in feed.

.vscode/settings.json

@@ -76,6 +76,7 @@
     "jmoiron",
     "jungshik",
     "junkfix",
+    "katex",
     "khalil",
     "khtml",
     "koanughi",

src/pages/feed.ts

@@ -58,6 +58,7 @@ const cleanupContent = async (html: string) => {
       return node;
     },
     sanitize({
+      dropElements: ['style'],
       dropAttributes: {
         class: ['*'],
         'data-astro-source': ['*'],
@@ -69,7 +70,7 @@ const cleanupContent = async (html: string) => {
         'data-language': ['*'],
         'data-footnotes': ['*'],
       },
-      allowCustomElements: false,
+      allowCustomElements: true,
       allowComments: false,
     }),
   ]);