websites: apps.d.x: Switch to mod_md for cert

The _apps.du5t1n.xyz_ site now obtains its certificate from Let's
Encrypt using the Apache _mod_md_ (managed domain) module.  This
dramatically simplifies the deployment of this certificate, eliminating
the need for _cert-manager_ to obtain it, _cert-exporter_ to add it to
_certs.git_, and Jenkins to push it out to the web server.

certs/websites/apps.du5t1n.xyz.cer

@@ -1 +0,0 @@
-../../.certs/certificates/apps.du5t1n.xyz.crt

certs/websites/apps.du5t1n.xyz.key

@@ -1 +0,0 @@
-../../.certs/certificates/apps.du5t1n.xyz.key

roles/websites/apps.du5t1n.xyz/files/apps.du5t1n.xyz.httpd.conf

@@ -1,3 +1,5 @@
+MDomain apps.du5t1n.xyz
+
 <VirtualHost _default_:80>
 ServerName apps.du5t1n.xyz
 
@@ -9,8 +11,6 @@ RewriteRule (.*) https://%{SERVER_NAME}$1 [R=301,L]
 ServerName apps.du5t1n.xyz
 
 Include conf.d/ssl.include
-SSLCertificateKeyFile /etc/pki/tls/private/apps.du5t1n.xyz.key
-SSLCertificateFile /etc/pki/tls/certs/apps.du5t1n.xyz.cer
 
 <IfModule mod_headers.c>
 	Header always set Strict-Transport-Security "max-age=63072000; includeSubDomains"

roles/websites/apps.du5t1n.xyz/meta/main.yml

@@ -1,7 +0,0 @@
-dependencies:
-- role: cert
-  vars:
-    cert_src: websites/apps.du5t1n.xyz.cer
-    cert_dest: /etc/pki/tls/certs/apps.du5t1n.xyz.cer
-    cert_key_src: websites/apps.du5t1n.xyz.key
-    cert_key_dest: /etc/pki/tls/private/apps.du5t1n.xyz.key