Once you have built a static version of your MyST project via myst build --html, it can be served on an Apache web server (httpd) instance.
For example, let’s assume your web server’s base URL is http://www.example.com and it uses /var/www/html as its DocumentRoot. If you copy the _build/html/ directory to /var/www/html/my-project using
cp -r _build/html /var/www/html/my-project
then the resulting URL would be http://www.example.com/my-project.