Remove dead tutorial (#1702)

This PR removes the [dead allblogtools.com tutorial][1].

  [1]: http://www.allblogtools.com/tricks-and-hacks/beautify-source-codes-in-your-posts-with-prism-syntax-highlighter-for-blogger/

index.html

@@ -234,7 +234,6 @@ <h1>Third-party tutorials</h1>
 		<li><a href="http://crambler.com/how-to-implement-prism-js-syntax-highlighting-into-your-wordpress-site/">How To Implement Prism.js Syntax Highlighting Into Your WordPress Site</a></li>
 		<li><a href="http://wp.tutsplus.com/tutorials/plugins/adding-a-syntax-highlighter-shortcode-using-prism-js/">Adding a Syntax Highlighter Shortcode Using Prism.js | WPTuts+</a></li>
 		<li><a href="https://www.stramaxon.com/2012/07/prism-syntax-highlighter-for-blogger.html">Implement PrismJs Syntax Highlighting to your Blogger/BlogSpot</a></li>
-		<li><a href="http://www.allblogtools.com/tricks-and-hacks/beautify-source-codes-in-your-posts-with-prism-syntax-highlighter-for-blogger/">Beautify Source Codes In Your Posts With Prism Syntax Highlighter For Blogger</a></li>
 		<li><a href="https://schier.co/blog/2013/01/07/how-to-re-run-prismjs-on-ajax-content.html">How To Re-Run Prism.js On AJAX Content</a></li>
 		<li><a href="https://www.semisedlak.com/highlight-your-code-syntax-with-prismjs">Highlight your code syntax with Prism.js</a></li>
 		<li><a href="https://usetypo3.com/fs-code-snippet.html">A code snippet content element powered by Prism.js for TYPO3 CMS</a></li>