Drop the demo.lumbridgecorp.com alias; one hostname

The site is demo.primeintellectgrowth.com and nothing else. The Caddy block,
the deploy smoke test, the mirrored Caddyfile and the docs all carried the
second name; all four no longer do.

deploy/deploy.sh

@@ -14,11 +14,6 @@ HOST="${PIG_DEMO_HOST:-ubuntu@100.92.185.76}"
 ROOT="/var/www/demo.primeintellectgrowth.com"
 SNAPS="${ROOT}-rollbacks"
 URL="https://demo.primeintellectgrowth.com"
-# Served from the same root under a second name. Checked because DNS for
-# lumbridgecorp.com is a WILDCARD: the alias resolves whether or not Caddy knows
-# about it, and an unconfigured name fails the TLS handshake outright rather
-# than 404ing — which reads as "the site is down", not "wrong hostname".
-ALIAS="https://demo.lumbridgecorp.com"
 
 cd "$(dirname "$0")/.."
 
@@ -74,8 +69,5 @@ for path in /sitemap.xml /robots.txt /og/wordle.png; do
   [ "$code" = "200" ] || { echo "FAILED: $path returned $code"; exit 1; }
 done
 
-alias_code=$(curl -sS -o /dev/null -w '%{http_code}' --max-time 30 "$ALIAS/" || echo 000)
-echo "    alias $ALIAS -> $alias_code"
-[ "$alias_code" = "200" ] || { echo "FAILED: the alias hostname returned $alias_code"; exit 1; }
 
 echo "==> live: $URL"