Update copy to post-July-2026 reality and notify on signups

- Rewrite copy from "this will happen" to "this has happened": direct
  registration closed 1 July 2026, transition ends 30 June 2028
- Fix timeline (30 June 2028, not 1 July), update FAQ + JSON-LD, add FAQ
  on registering new domains now
- Send signup notification mail to henrik@i80.dk via smtp.i80.dk, with
  credentials from Consul KV
- Fix CI health check URL (punktfri.dk)

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

README.md

@@ -22,6 +22,11 @@ Visit `http://localhost:5000`
 | `LOG_FILE` | `signups.log` | Signup log file path |
 | `ADMIN_USER` | `admin` | Admin username |
 | `ADMIN_PASS` | `punktfri2024` | Admin password |
+| `NOTIFY_EMAIL` | `henrik@i80.dk` | Receives a mail on every signup |
+| `SMTP_HOST` | *(empty)* | SMTP server; notifications are skipped when unset |
+| `SMTP_PORT` | `587` | SMTP port (STARTTLS) |
+| `SMTP_USER` / `SMTP_PASS` | *(empty)* | SMTP login (Consul KV `punktfri/smtp_user`, `punktfri/smtp_pass` in Nomad) |
+| `SMTP_FROM` | `SMTP_USER` | Sender address (Consul KV `punktfri/smtp_from`) |
 
 Change `ADMIN_USER` and `ADMIN_PASS` before deploying publicly.