do not hardcode mail

ansible/host_vars/bde-nk20-beta.adh.crans.org.yml

@@ -3,3 +3,4 @@ note:
   server_name: note-beta.crans.org
   git_branch: beta
   cron_enabled: false
+  email: notekfet2020@lists.crans.org

ansible/host_vars/bde-note.adh.crans.org.yml

@@ -1,5 +1,5 @@
 ---
 note:
   server_name: note.crans.org
-  git_branch: master
-  cron_enabled: true
+  git_branch: beta
+  cron_enabled: false

ansible/host_vars/bde3-virt.adh.crans.org.yml

@@ -3,3 +3,4 @@ note:
   server_name: note-dev.crans.org
   git_branch: beta
   cron_enabled: false
+  email: notekfet2020@lists.crans.org

ansible/roles/4-certbot/templates/letsencrypt/conf.d/nk20.ini.j2

@@ -10,11 +10,11 @@ rsa-key-size = 4096
 # server = https://acme-staging.api.letsencrypt.org/directory
 
 # Uncomment and update to register with the specified e-mail address
-email = notekfet2020@lists.crans.org
+email = {{ note.email }}
 
 # Uncomment to use a text interface instead of ncurses
 text = True
 
 # Use DNS-01 challenge
-authenticator = nginx
+authenticator = standalone