nginx: update description as per official description, update link to point to the "about" page

README.md

@@ -749,7 +749,7 @@ _See also: [awesome-selfhosted/Database Management](https://github.com/awesome-s
 - [Cherokee](http://cherokee-project.com/) - Innovative, feature rich, lightning fast and easy to configure open source web server designed for the next generation of highly concurrent secured web applications. ([Source Code](https://github.com/cherokee/webserver/))
 - [Hiawatha](https://www.hiawatha-webserver.org/) - An advanced and secure webserver for Unix. ([Source Code](https://gitlab.com/hsleisink/hiawatha))
 - [Lighttpd](http://www.lighttpd.net/) - Secure, fast, compliant, and very flexible web server that has been optimized for high-performance environments.
-- [Nginx](http://nginx.org/) - Reverse proxy, load balancer, HTTP cache, and web server.
+- [Nginx](https://nginx.org/en/) - HTTP and reverse proxy server, mail proxy server, and generic TCP/UDP proxy server.
 - [uWSGI](https://github.com/unbit/uwsgi/) - The uWSGI project aims at developing a full stack for building hosting services.
 
 *Web Performance.*