Fix nginx config: Copy to main nginx.conf instead of template

Move nginx.conf from templates directory to main config to allow load_module directives.

Author: rubenhensen

docker/nginx.Dockerfile

@@ -79,7 +79,7 @@ RUN set -ex \
     && rm -rf /tmp/packages \
     && rm -rf /var/lib/apt/lists/
 
-COPY docker/nginx.conf /etc/nginx/templates/nginx.conf.template
+COPY docker/nginx.conf /etc/nginx/nginx.conf
 COPY postguard-tb-addon/dist /usr/share/nginx/html/downloads
 COPY build /usr/share/nginx/html/postguard