roles/nginx: Add role for nginx

This role installs nginx and provides a base/skeleton configuration
suitable for most deployments.

roles/nginx/vars/CentOS-8.yml

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+nginx_default_ssl_ciphers:
+- PROFILE=SYSTEM

roles/nginx/vars/Fedora.yml

@@ -0,0 +1,2 @@
+nginx_default_ssl_ciphers:
+- PROFILE=SYSTEM

roles/nginx/vars/defaults.yml

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+nginx_default_ssl_ciphers:
+- HIGH
+- '!aNULL'
+- '!MD5'

roles/nginx/vars/main.yml

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+nginx_packages:
+- nginx