nginx(role): remove distribution check and simply have docs

Remove distribution check to simplify role and simply state that this
role supports Debian as the NGINX Debian repos are used.

roles/nginx/README.md

@@ -12,9 +12,7 @@ The entry points available for external use are:
 
 ## Supported Distributions
 
-The following distributions are supported:
-
-- Debian 11
+Debian as the NGINX Debian repos are used.
 
 ## Required Arguments
 

roles/nginx/meta/main.yaml

@@ -1,9 +0,0 @@
----
-dependencies:
-  - role: distribution_check
-    vars:
-      distribution_check__distribution_support_spec:
-        - name: Debian
-          major_versions:
-            - "11"
-            - "12"