docs: remove redirect for non matching /en/* to /en/404

This proceeds before docusaurus' redirects which breaks /en/category.html -> /en/category -> /en/routes/category

website/static/_redirects

@@ -1,7 +1,5 @@
 # https://docs.netlify.com/routing/redirects/redirect-options/#custom-404-page-handling
 # symlink logo
 /logo.png /img/logo.png 200
-# redirect all nonexistent paths in /en/ to /en/404
-/en/* /en/404 404
 # redirect all en browser language request to homepage to /en/
 / /en 302 Language=en