By looking at those sites and their sources, you may better see what’s possible and how it’s achieved.
ddoc documentation
ddoc’s own documentation is of course made with ddoc.
See the source at https://github.com/Canop/ddoc/tree/main/website
ddoc columns example
This example site features a different layout, with the site navigation permanetely visible on the left.
See the source at https://github.com/Canop/ddoc/tree/main/example/columns
bacon
bacon’s website looks a lot like the one of ddoc, with different colors but the same layout.
website: https://dystroy.org/bacon
Source: https://github.com/Canop/bacon/tree/main/website
broot
broot’s website is similar to ddoc’s too, but shows how a bigger documentation fits ddoc without problem.
broot uses additional scripts (in /src/js) and stylesheets (in /src/css) to highlight code and to group block codes and wrap them with tabs.
website: https://dystroy.org/broot
Source: https://github.com/Canop/broot/tree/main/website
dysk
website: https://dystroy.org/dysk