Logo link
To remove index.php?route=common/home from logo url edit catalog/controller/common/header.php and replace
$data['home'] = $this->url->link('common/home');
with
$data['home'] = $this->url->link('');
and then refresh Opencart modifications
To remove index.php?route=common/home from logo url edit catalog/controller/common/header.php and replace
$data['home'] = $this->url->link('common/home');
with
$data['home'] = $this->url->link('');
and then refresh Opencart modifications