Improve public SEO and align chrome with EXIT Realty teal.

Add meta/canonical/OG, robots/sitemap, and contact-form admin email; restyle consent, icons, and scroll-top away from theme blue.

site/public/middleware.py

@@ -21,6 +21,8 @@ class UnderConstructionMiddleware:
         "/portal/messaging/webhooks/",
         "/unsubscribe/",
         "/api/address-suggest",
+        "/robots.txt",
+        "/sitemap.xml",
     )
 
     def __init__(self, get_response):