Fix Broken Profile Links (#5286)

* Expose the block_public setting to head.tpl

* Do not include hovercard.js if block_public

src/App.php

@@ -554,6 +554,7 @@ class App
 			'$touch_icon'      => $touch_icon,
 			'$stylesheet'      => $stylesheet,
 			'$infinite_scroll' => $invinite_scroll,
+			'$block_public'    => intval(Config::get('system', 'block_public')),
 		]) . $this->page['htmlhead'];
 	}