Network install problems

This is a great plugin – thank you. Unfortunately, it does not install well on WordPress networks (multisite).

The core issue seems to be that mathjax_install() does not add the default options to individual sites when the plugin is activated network wide. Therefore, the options are not available when the shortcode tries to run. Yes, I could visit each site individually and update the options page, but our network has hundreds of sites – so, a network option page would be great!

I quickly hacked around this by triggering mathjax_install() if the options are missing:

	
public static function init() {
	register_activation_hook( __FILE__, [ __CLASS__, 'mathjax_install' ] );
	register_deactivation_hook( __FILE__, [ __CLASS__, 'mathjax_uninstall' ] );

        // hack to set defaults on all sites in network
        if(!get_option('kblog_mathjax_config')){
            add_action( 'init', [ __CLASS__, 'mathjax_install' ] );
        }
        // end hack