Revert "Revert "Remove NM connectivity check file from al.org""

We did the revert to help a small business, but they had some time to
fix their setup, so we can revert the revert.

This reverts commit a842fbe7.

roles/archweb/defaults/main.yml

@@ -10,7 +10,6 @@ archweb_domains_redirects:
         'planet.archlinux.org': '/planet$request_uri'
 archweb_domains_templates:
         'ipxe.archlinux.org': 'ipxe.archlinux.org.j2'
-archweb_network_check_domain: 'www.archlinux.org'
 archweb_allowed_hosts: ["{{ archweb_domain }}", 'ipxe.archlinux.org']
 archweb_nginx_conf: '/etc/nginx/nginx.d/archweb.conf'
 archweb_repository: 'https://github.com/archlinux/archweb.git'

roles/archweb/templates/maintenance-nginx.d.conf.j2

@@ -16,13 +16,6 @@ server {
 
     include snippets/letsencrypt.conf;
 
-{% if domain == archweb_network_check_domain %}
-    location /check_network_status.txt {
-        access_log off;
-        add_header Cache-Control "max-age=0, must-revalidate";
-        return 200 'NetworkManager is online';
-    }
-{% endif %}
     location / {
         access_log off;
         return 301 https://$server_name$request_uri;
@@ -64,12 +57,6 @@ server {
 
     include snippets/letsencrypt.conf;
 
-    location /check_network_status.txt {
-        access_log off;
-        add_header Cache-Control "max-age=0, must-revalidate";
-        return 200 'NetworkManager is online';
-    }
-
     location / {
         access_log off;
         return 301 https://$server_name$request_uri;

roles/archweb/templates/nginx.d.conf.j2

@@ -34,14 +34,6 @@ server {
 
     include snippets/letsencrypt.conf;
 
-{% if domain['domain'] == archweb_network_check_domain %}
-    location /check_network_status.txt {
-        access_log off;
-        add_header Cache-Control "max-age=0, must-revalidate";
-        return 200 'NetworkManager is online';
-    }
-
-{% endif %}
     location /.well-known {
         add_header Access-Control-Allow-Origin *;
         return 301 https://$server_name$request_uri;
@@ -93,12 +85,6 @@ server {
 
     include snippets/letsencrypt.conf;
 
-    location /check_network_status.txt {
-        access_log off;
-        add_header Cache-Control "max-age=0, must-revalidate";
-        return 200 'NetworkManager is online';
-    }
-
     location / {
         access_log off;
         return 301 https://$server_name$request_uri;