Rewrite info about nginx on CentOS

Author: axilleas

web-server/nginx/README.md

@@ -1,13 +1,27 @@
-# CentOS related Nginx notes
+## CentOS related Nginx notes
 
-* If nginx is installed through the package manager, adjust sites in `/etc/nginx/conf.d/` instead of `/etc/nginx/sites-available/`.
+### Different conf directories
 
-* Replace the default `nginx` user with `git` and group `root` in `/etc/nginx/nginx.conf`:
+If nginx is installed through the package manager, adjust sites in `/etc/nginx/conf.d/` 
+instead of `/etc/nginx/sites-available/` or create those directories and tell `nginx`
+to monitor them:
 
-      #user             nginx;
-      user              git root;
+    sudo mkdir /etc/nginx/sites-{available,enabled}
 
-  or add `nginx` user to `git` group.
+Then edit `/etc/nginx/nginx.conf` and replace `include /etc/nginx/conf.d/*.conf;`
+with `/etc/nginx/sites-enabled/*;`
 
-      sudo usermod -a -G git nginx
-      sudo chmod g+rx /home/git/
+### Give nginx access to git group
+
+In order for GitLab to display properly you have to make either one of the changes
+below. The first one is recommended.
+
+Add `nginx` user to `git` group:
+
+    sudo usermod -a -G git nginx
+    sudo chmod g+rx /home/git/
+
+or replace the default `nginx` user with `git` and group `root` in `/etc/nginx/nginx.conf`:
+
+    #user             nginx;
+    user              git root;