Ако правилно съм разбрал по обясненията, започнете с четене за Virtual Hosts в конфа на Апаха.
Направих цялата процедура наново, имам работещ Уордпрес и чакам ДНС системата да се ъпдейтне... Нещо много време и трябва. Принципно става доста бързо, но от много пипане там сега се бави.
Записах и видео на всичко което правя и ще го кача да го погледнете. 
Иначе конфигурационните файлове - на Апаче и на сайта са тези:
slavy@ubuntu2:/etc/apache2/sites-available$ cat 000-default.conf
<VirtualHost *:80>
   # The ServerName directive sets the request scheme, hostname and port that
   # the server uses to identify itself. This is used when creating
   # redirection URLs. In the context of virtual hosts, the ServerName
   # specifies what hostname must appear in the request's Host: header to
   # match this virtual host. For the default virtual host (this file) this
   # value is not decisive as it is used as a last resort host regardless.
   # However, you must set it for any further virtual host explicitly.
   #ServerName 
http://www.example.com        ServerName 130.61.23.153
   ServerAdmin webmaster@localhost
   DocumentRoot /var/www/example.com/public_html
   # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
   # error, crit, alert, emerg.
   # It is also possible to configure the loglevel for particular
   # modules, e.g.
   #LogLevel info ssl:warn
   ErrorLog ${APACHE_LOG_DIR}/error.log
   CustomLog ${APACHE_LOG_DIR}/access.log combined
   # For most configuration files from conf-available/, which are
   # enabled or disabled at a global level, it is possible to
   # include a line for only one particular virtual host. For example the
   # following line enables the CGI configuration for this host only
   # after it has been globally disabled with "a2disconf".
   #Include conf-available/serve-cgi-bin.conf
</VirtualHost>
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
slavy@ubuntu2:/etc/apache2/sites-available$ cat mgn.conf
<VirtualHost *:80>
        # The ServerName directive sets the request scheme, hostname and port that
        # the server uses to identify itself. This is used when creating
        # redirection URLs. In the context of virtual hosts, the ServerName
        # specifies what hostname must appear in the request's Host: header to
        # match this virtual host. For the default virtual host (this file) this
        # value is not decisive as it is used as a last resort host regardless.
        # However, you must set it for any further virtual host explicitly.
        #ServerName 
http://www.example.com        ServerName mgnuniverse.site
        ServerAlias 
http://www.mgnuniverse.site        ServerAdmin 
ivanovslavy@gmail.com        DocumentRoot /var/www/example.com/public_html/mgn
        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
        # error, crit, alert, emerg.
        # It is also possible to configure the loglevel for particular
        # modules, e.g.
        #LogLevel info ssl:warn
        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined
        # For most configuration files from conf-available/, which are
        # enabled or disabled at a global level, it is possible to
        # include a line for only one particular virtual host. For example the
        # following line enables the CGI configuration for this host only
        # after it has been globally disabled with "a2disconf".
        #Include conf-available/serve-cgi-bin.conf
RewriteEngine on
RewriteCond %{SERVER_NAME} =www.mgnuniverse.site [OR]
RewriteCond %{SERVER_NAME} =mgnuniverse.site
RewriteRule ^ 
https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
</VirtualHost>
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet