Hi Tim,

At this point Odoo doesn't really have an easy or good way for this. You could export/import the website pages its content by exporting/importing the XML records but it is far from ideal. Have a look at the URL http://yourdomain.com/website/pages where you can see an overview of custom pages since Odoo 11. If you click on edit here you'll go to the backend where you can see the XML record. You could export or import from here. If you have technical knowledge you can do this through XML-RPC.

The meta description is another thing though. This works a bit different in Odoo and works with a JavaScript widget that loads and sets the value on the page. See https://github.com/odoo/odoo/search?q=js_seo_meta_keywords&unscoped_q=js_seo_meta_keywords for the code. Sadly there is no functionality right now to export these values. The only way to modify those values is by going to the page and clicking on "Promote" > "Optimize SEO":

From this dialog you can set/change the title, description and the meta details:

Regards,
Yenthe