Neocities now allows you to create a domain name for your site directly through Neocities. Instead of being at <%= current_site.username %>.neocities.org, your site would be accessible via your full domain name (example.com). You get one free domain per Neocities account.
<% if parent_site.supporter? %> Register your domain name now <% else %> Getting a domain name requires a Supporter account. Upgrade now. <% end %>