Configure subdomain for wikis and sites
The subdomains are currently hardcoded, see https://framagit.org/framasoft/framasite/commit/7aefa0e19692a5667bbbd82409264f17d125502e
The subdomains are currently hardcoded, see https://framagit.org/framasoft/framasite/commit/7aefa0e19692a5667bbbd82409264f17d125502e