Change: move custom.css linking to head to avoid FOUC (#2916)

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Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/components/filecontent.jsx

@@ -1,10 +0,0 @@
-import useSWR from "swr";
-
-export default function FileContent({ path, loadingValue, errorValue, emptyValue = "" }) {
-  const fetcher = (url) => fetch(url).then((res) => res.text());
-  const { data, error, isLoading } = useSWR(`/api/config/${path}`, fetcher);
-
-  if (error) return errorValue;
-  if (isLoading) return loadingValue;
-  return data || emptyValue;
-}