How to recover index.php on Joomla?

Hello. Wanted to add dimension code and broke the site.
Somehow when the file is saved in the tags is added Fira:

<link href="<?php echo $this->baseurl; ?>/templates/<?php echo $this->template ?>/css/layout.css" rel="stylesheet" type="text/css">
<script type="text/JavaScript" src="<?php echo $this->baseurl; ?>/templates/<?php echo $this->template?>/superfish/js/hoverIntent.js"></script></link>

Please help! How to fix?
June 8th 19 at 17:10
1 answer
June 8th 19 at 17:12
1. download official site the installation file.
2. Extract from there index.php and replace your current file.

and what do you do usually do in the template file of the site
or added to a separate module

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