918Permanent Redirect of all Subpages to new Server

301 Redirect is great, if you want to keep you old structure and only change the server.

Redirect 301 / https://www.trembl.org/
Any page of your old.site/about would get redirected to https://www.trembl.org.about

If you want to redirect all your page links from your old.site (e.g. old.site, old.site/aaa, old.site/bbb, …) to https://www.trembl.org, use this RewriteRule:

RewriteEngine On
RewriteRule ^(.*)$ https://www.trembl.org/ [R=301]