dead pdf libs

README.md

 * [Browsershot](https://github.com/spatie/browsershot) - Convert HTML to an image, PDF or string.
 * [Dompdf](https://github.com/dompdf/dompdf) - A HTML to PDF converter.
 * [Gotenberg](https://github.com/gotenberg/gotenberg-php) - A PHP client for interacting with Gotenberg.
-* [PHPPdf](https://github.com/psliwa/PHPPdf) - A library for generating PDFs and images from XML.
 * [Snappy](https://github.com/KnpLabs/snappy) - A PDF and image generation library.
-* [WKHTMLToPDF](https://github.com/wkhtmltopdf/wkhtmltopdf) - A tool to convert HTML to PDF.
 
 ### Office
 *Libraries for working with office suite documents.*