Add nginx to Glossary

Author: stevepiercy

docs/glossary.md

@@ -300,4 +300,7 @@ PostgreSQL
 
 HAProxy
     [HAProxy](https://www.haproxy.org/) is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
+
+nginx
+    [nginx](https://docs.nginx.com/nginx/) (pronounced "engine x") is an HTTP and reverse proxy server, a mail proxy server, and a generic TCP/UDP proxy server, originally written by Igor Sysoev.
 ```

docs/install/containers/examples/nginx-volto-plone-zeo.md

@@ -10,7 +10,8 @@ html_meta:
 
 This example is a very simple setup with one or more backend instances accessing a ZEO server and data being persisted in a Docker volume.
 
-Nginx in this example is used as a [reverse proxy](https://docs.nginx.com/nginx/admin-guide/web-server/reverse-proxy/").
+{term}`nginx` in this example is used as a [reverse proxy](https://docs.nginx.com/nginx/admin-guide/web-server/reverse-proxy/).
+
 
 ## Setup
 
@@ -81,6 +82,7 @@ server {
 You can either use `localhost`, or add it in your `etc/hosts` file or DNS to point to the docker host IP.
 ```
 
+
 ### Service configuration with `docker-compose`
 
 Now let's create a `docker-compose.yml` file: