refactor: consolidate pure-redirect server blocks into conf.d/redirects.conf

Moves 12 redirect-only server blocks out of their mixed host files
(content, aria, hikari, celestine, support, scheduling, portfolio) and
into a dedicated redirects.conf. Deletes the now-empty scheduling.conf
and its sites-enabled symlink.

nginx/nginx/sites-available/portfolio.conf

@@ -1,5 +1,4 @@
-# Personal portfolio and vanity domains (naomi.lgbt, naomi.party, nhcarrigan.com, nhcarrigan.link, resume)
-# plus a wildcard catch-all that redirects *.naomi.lgbt → *.nhcarrigan.com.
+# Personal portfolio and vanity domains (naomi.lgbt, naomi.party, nhcarrigan.com, nhcarrigan.link, resume).
 server {
   listen 443 ssl;
   server_name naomi.lgbt;
@@ -160,16 +159,3 @@ server {
   include /etc/nginx/snippets/deny-dotfiles.conf;
 }
 
-# Wildcard catch-all — must remain last so specific subdomains take priority
-server {
-    listen 443 ssl;
-    server_name ~^(?<subdomain>.+)\.naomi\.lgbt$;
-
-    ssl_certificate     /etc/letsencrypt/live/*.naomi.lgbt/fullchain.pem;
-    ssl_certificate_key /etc/letsencrypt/live/*.naomi.lgbt/privkey.pem;
-
-    location / {
-        return 301 https://$subdomain.nhcarrigan.com$request_uri;
-    }
-  include /etc/nginx/snippets/deny-dotfiles.conf;
-}