new logo update readme

README.md

-# reveal.js ![tests](https://github.com/hakimel/reveal.js/workflows/tests/badge.svg) <a href="https://slides.com?ref=github"><img src="https://s3.amazonaws.com/static.slid.es/images/slides-github-banner-320x40.png?1" alt="Slides" width="160" height="20"></a>
+<p align="center">
+  <img src="https://hakim-static.s3.amazonaws.com/reveal-js/logo/v1/reveal-black-text.svg" alt="reveal.js logo" width="300">
+  <br><br>
+  <img src="https://github.com/hakimel/reveal.js/workflows/tests/badge.svg">
+  <img src="https://s3.amazonaws.com/static.slid.es/images/slides-github-banner-320x40.png?1" alt="Slides" width="160" height="20"></a>
+</p>
 
 reveal.js is an open source HTML presentation framework. It's a tool that enables anyone with a web browser to create fully featured and beautiful presentations for free. [Check out the live demo](https://revealjs.com/).
 
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 ## Documentation
-The full reveal.js documentation is available at [revealjs.com](https://revealjs.netlify.com).
+The full reveal.js documentation is available at [revealjs.com](https://revealjs.netlify.app).
 
 ## License