Replace personal URLs with placeholders and fix variable replacement logic

.env.example

@@ -60,7 +60,7 @@ ACME_EMAIL=${DEFAULT_EMAIL}
 ADMIN_EMAIL=${DEFAULT_EMAIL}  # Used for admin user account
 AUTHELIA_ADMIN_USER=${DEFAULT_USER}
 AUTHELIA_ADMIN_EMAIL=${DEFAULT_EMAIL}
-AUTHELIA_ADMIN_PASSWORD=generate-with-openssl-rand-hex-64
+AUTHELIA_ADMIN_PASSWORD_HASH=generate-with-openssl-rand-hex-64
 
 # SMTP for Authelia Notifications
 SMTP_USERNAME=${SMTP_EMAIL_FROM}