remove Voices of the ElePHPant link (dead)

README.md

 * [The Laracasts Snippet](https://laracasts.simplecast.com) - The Laracasts snippet, each episode, offers a single thought on some aspect of web development.
 * [The Laravel Podcast](https://laravelpodcast.com/) - Laravel and PHP development news and discussion.
 * [The PHP Roundtable](https://phproundtable.com/) - The PHP Roundtable is a casual gathering of developers discussing topics that PHP nerds care about.
-* [Voices of the ElePHPant](https://voicesoftheelephpant.com/) - Interviews with the people who make the PHP community special.
 
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