Fixed bug where users littlelink pages (domain.com/@username) would display a 404 error. This was caused due to the .env config file not containing an App URL. This issue could be solved by simply adding a URL to the config, this is now not necessary anymore, making the setup process easier and less confusing.
I changed every instance of "{{ config('app.url') }}" to "{{ url(' ') }}". This effectively automatically uses the correct URL for LittleLink links, even if LittleLink Custom is set up in a subdirectory.
In my testing, I couldn't find any problems this might have caused, so this appears to do the job just as well as setting the URL in the config. If I find any issues with this, I will revert this change.
