Chore: move custom css loading, add letter-spacing (#4359)

src/pages/index.jsx

@@ -374,8 +374,6 @@ function Home({ initialSettings }) {
         )}
         <meta name="msapplication-TileColor" content={themes[settings.color || "slate"][settings.theme || "dark"]} />
         <meta name="theme-color" content={themes[settings.color || "slate"][settings.theme || "dark"]} />
-        <link rel="preload" href="/api/config/custom.css" as="style" />
-        <link rel="stylesheet" href="/api/config/custom.css" /> {/* eslint-disable-line @next/next/no-css-tags */}
       </Head>
 
       <Script src="/api/config/custom.js" />