Set an Nginx vhost to the root where your demos are stored, like this:

server {
        listen 80; ## listen for ipv4; this line is default and implied
        #listen   [::]:80 default ipv6only=on; ## listen for ipv6

        root /var/www/html/;
        index index.html index.htm index.php;

        # Make site accessible from http://localhost/
        server_name .domainname-goes-here.com;


        error_page  404              /404.html;
        location = /404.html {
        root   /usr/share/nginx/html;
        }

        # redirect server error pages to the static page /50x.html
        #
                error_page   500 502 503 504  /50x.html;
                location = /50x.html {
                root   /usr/share/nginx/html;
        }

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #

        location = /favicon.ico {
                log_not_found off;
                access_log off;
        }

        location = /robots.txt {
                allow all;
                log_not_found off;
                access_log off;
        }

        location / {
                # This is cool because no php is touched for static content.
                # include the "?$args" part so non-default permalinks doesn't break when using query string
                #try_files $uri $uri/ /index.php?$args;
        }

        location ~ \.php$ {
                #NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
                include fastcgi.conf;
                fastcgi_intercept_errors on;
                fastcgi_pass php;
        }

}

Then just go to the domain/subdomain you set for it and add the folder name ir example.com/page2/

make sure to have a index file (index.php, html, etc..).

if you want it to be accesible via IP you need to make it your default website/virtual host by changing this line:

# Make site accessible from http://localhost/
server_name .domainname-goes-here.com;

to

# Make site accessible from http://localhost/
server_name _;

but it looks professional to use a domain/subdomain and is easier to remember. make sure you don't have another virtual host as default one!