[fix] migrate localfont to hosted font

pages/404.tsx

@@ -14,13 +14,11 @@ export default function NotFoundPage() {
     <Page>
       <NavBar />
       <ContentContainer>
-        <h2 className={`my-5 flex justify-center text-2xl font-bold font-fang-zheng-xiao-biao-song`}>
-          {"404 NOT FOUND"}
-        </h2>
+        <h2 className={`my-5 flex justify-center text-2xl font-bold caption-font`}>{"404 NOT FOUND"}</h2>
         <Separator />
         <div className="my-5 flex flex-col justify-center">
           <TfiFaceSad className="mx-auto my-4" size={"6em"} />
-          <p className={`font-source-serif-screen mx-auto my-3 text-center text-xl`}>
+          <p className={`content-font mx-auto my-3 text-center text-xl`}>
             {"This page does not exist for it might be removed or closed."}
           </p>
           <div className="my-5 flex justify-center">