[fix] Only redirect if it's not already index.php

plugins/nextcloud-md.js

@@ -1 +1,4 @@
-module.exports = app => app.use((req, res, next) => res.redirect('/index.php' + req.originalUrl));
+module.exports = app => app.use((req, res, next) =>
+	req.originalUrl.includes('index.php')
+		? next()
+		: res.redirect('/index.php' + req.originalUrl));