remove the sites-enabled readme

this file is considered a site config  file, preventing the use of the repo as is

sites-enabled/README.md

@@ -1,12 +0,0 @@
-Sites Enabled
--------------
-
-Symlink to `../sites-available/` for any site you want to enable. Conversely, remove the symlink
-in this folder to disable a site without permanently deleting the site's configuration.
-
-E.g. (we suppose your nginx configuration files are stored in `/etc/nginx`)
-```sh
-    $ pwd
-      --> /etc/nginx
-    # ln -s /etc/nginx/sites-available/example.com sites-enabled/example.com
-```