A basic build requires just make and sed.
The optional automatic rebuilds require find + entr.
Run make in in this directory to execute the basic build.
This will place the generated HTML files in ./build/.
If you have find and entr installed, you can have automatic rebuilds by running make watch.
You can deploy the web page to GitHub Pages by running make deploy.
This will upload the files to the gh-pages branch.
Don’t forget to also commit the changes to the source files on the regular main branch!