Merge ~valentinviennot/ubuntu-docker-images:update-nginx-readme into ~ubuntu-docker-images/ubuntu-docker-images/+git/nginx:edge

[Valentin Viennot]

Consistency and cleaning.

[Sergio Durigan Junior (sergiodj)]

LGTM. I will address my comment in a subsequent commit.

review: Approve

diff --git a/README.md b/README.md
index 7e80594..e13e504 100644
--- a/README.md
+++ b/README.md
@@ -2,16 +2,12 @@
 
 ## About Nginx
 
-Nginx ("engine X") is a high-performance web and reverse proxy server created by Igor Sysoev. It can be used both as a standalone web server and as a proxy to reduce the load on back-end HTTP or mail servers.
-
-Read more on the [nginx website](https://www.nginx.com/).
+Nginx ("engine X") is a high-performance web and reverse proxy server created by Igor Sysoev. It can be used both as a standalone web server and as a proxy to reduce the load on back-end HTTP or mail servers. Read more on the [nginx website](https://www.nginx.com/).
 
 ## Tags
 
 * `1.18.0-focal`, `1.18.0`, `1.18-focal`, `1.18`, `1-focal`, `1`, `focal`, `beta` - **/!\ this is a beta release**
 
-* `edge` = `1.18.0-0ubuntu1`
-
 ## Architectures supported
 
 * `amd64`, `arm64`, `ppc64el`, `s390x`
@@ -21,8 +17,7 @@ Read more on the [nginx website](https://www.nginx.com/).
 ### Docker CLI
 
 ```
-$ docker network create nginx-net --driver bridge
-$ docker run -d --name nginx --network nginx-net -p 8080:80 -d squeakywheel/nginx:edge
+$ docker run -d --name nginx -p 8080:80 -e TZ=Europe/London squeakywheel/nginx:edge
 ```
 
 You can now point your browser to http://localhost:8080/ and verify
@@ -32,44 +27,16 @@ that it works.
 
 | Parameter | Description |
 |---|---|
-| `-e TZ=UTC` | Timezone, e.g. `Europe/London` |
-| `-v /local/path/to/website:/var/www/html` | Mount and serve a local website |
-| `-v /my/config/nginx.conf:/etc/nginx/nginx.conf` | Mount a local configuration `nginx.conf` |
-
-#### Environment variables inside nginx configuration
-
-Nginx doesn't support environment variables inside most configuration blocks out-of-the-box, but this image is created in a way that makes this possible.
-
-You have to mount template files inside `/etc/nginx/templates`.  They will be processed and the results will be placed at `/etc/nginx/conf.d`.
+| `-e TZ=UTC` | Timezone. |
+| `-p 8080:80` | Expose Nginx on `localhost:8080`. |
+| `-v /path/to/website:/var/www/html` | Mount and serve a local website. |
+| `-v /path/to/.template:/etc/nginx/templates/.template` | Mount template files inside `/etc/nginx/templates`. They will be processed and the results will be placed at `/etc/nginx/conf.d`. (e.g. `listen ${NGINX_PORT};` will generate `listen 80;`). |
+| `-v /my/config/nginx.conf:/etc/nginx/nginx.conf` | Mount a local configuration `nginx.conf` (download this [example file](https://git.launchpad.net/~canonical-server/ubuntu-server-oci/+git/nginx/plain/examples/config/nginx.conf)). |
 
-Consider this `docker-compose.yml`:
-
-```
-web:
-  image: squeakywheel/nginx:edge
-  volumes:
-    - ./templates:/etc/nginx/templates
-  ports:
-    - 8080:80
-  environment:
-    - NGINX_PORT=80
-```
-
-And this `templates/default.conf.template`:
-
-```
-listen ${NGINX_PORT};
-```
-
-If you mount `templates/default.conf.template` inside `/etc/nginx/templates`, it will generate a `/etc/nginx/conf.d/default.conf` like:
-
-```
-listen 80;
-```
 
 #### Testing/Debugging
 
-In case you need to debug what it is happening with the container you can run `docker logs <name_of_the_container>`. But if you want to get access to an interactive shell run:
+In case you need to debug what it is happening with the container you can run `docker logs <name_of_the_container>`. To get access to an interactive shell run:
 
 ```
 $ docker exec -it <name_of_the_container> /bin/bash