Adapt Traefik templating to support multiple subdomains

[owine]

Initial thought was to detect root domain or www subdomain and automatically add the other but expanding that to support a list of subdomains would be a nice potential feature.

wordpress_web_subdomains:
  - "{{ wordpress_name }}"
  - "thething"
  - "www"

or

wordpress_web_fqdn:
- "{{ wordpress_web_subdomain }}.{{ wordpress_web_domain }}"
- "www.{{ wordpress_web_domain }}"
- "domain2.tld"