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I believe that the issue may stem from this line in your Apache configuration:
Redirect permanent / http://www.signa.com/
WordPress itself will perform a redirect via .htaccess or when a request is received so this is not necessary in your configuration and may be the source of the redirect loop.
Just wanted to hop in on this and request that you visit the URL below to regenerate your Keys & Salts since they are exposed in your initial post. These Keys & Salts are used by WordPress to secure data, such as passwords, and by exposing them, you’re potentially providing information that could be used against you should someone wish to try. https://api.wordpress.org/secret-key/1.1/salt/
Simply replace the following (I’ve stripped the Keys & Salts so they aren’t in my reply):
define('AUTH_KEY', '');
define('SECURE_AUTH_KEY', '');
define('LOGGED_IN_KEY', '');
define('NONCE_KEY', '');
define('AUTH_SALT', '');
define('SECURE_AUTH_SALT', '');
define('LOGGED_IN_SALT', '');
define('NONCE_SALT', '');
… with the output from the URL above.