chore: update 404 page

404.html

@@ -2,7 +2,7 @@
     // Check if the current path is versioned, if not, redirect to the default versioned path
     const versions = ["stable"]
     const defaultVersion = "stable"
-    const basePath = "freqtrade/en/"
+    const basePath = "en/"
     const targetRedirectPath = "404" // path to redirect to, relative to basePath
 
     // if path starts with version, redirect to versioned 404