Thanks for your comment!
The WP blog does have a previous and next button at the bottom of each post, just above the ‘leave a reply’ form. But I know, it is not so obvious.
We are planning to do a large overhaul of the WP blog and will build it in Laravel by using WP as a headless CMS and the WP API to get all information from WP. We’ll describe that process in the future as well!