Move Xmas campaign

Move complete directory (without .htaccess, which probably wasn’t doing anything) to root subdirectory here.
Change PayPal from live to sandbox.
Easy to add a standalone page to a WP site. Shame the reverse is not possible. Unfortunately it doesn’t appear in the sitemap.
Re-direct xmas.CAS to main site. Use
<meta http-equiv="refresh" content="0; URL=https://www.cardiff-astronomical-society.co.uk">
One line in header, no messing with .htaccess or DNS records. See W3c article