Added support for custom meta tags via a new config file.
Custom meta tags will only be active if "CUSTOM_META_TAGS" is set to "true" in the config.
Replaced "<html lang="en">" with "@include('layouts.lang')" meaning HTML lang can be changed in the new config, defaults to en if not active or not defined.
Added PHPinfo section to the config editor to display information about the current state of PHP.
This new section can be found on the Admin Panel under 'Admin>Config>PHP Info'.
For this, a new route and section in the admin controller have been added. The page is loaded as phpinfo.blade.php with the route .../panel/phpinfo if the user is authenticated as an admin.
I added the usual dark mode detection to the page, with an extra section that changes the background color according to the preferred theme setting. The page itself can be downloaded and saved as an HTML, for this JavaScript is used.
