first off, you’ll need Linux and GNU make. things might work on *nix without GNU tools, but no promises. for markdown support, you’ll need kramdown.
clone this example site repository, or get the base Makefile here.
your input files go in the src/ directory. modify the files field at the top of the Makefile to add new outputs.
for example, to produce out/index.html and out/site.css from src/index.md and src/site.css, your files field should look like this:
files = index.html site.css
the default Makefile uses templates/base-start.html and templates/base-end.html at the start and end of each .html output file. simply remove the default template rule (see template guide) to stop this.
run make. the makefile will generate your output files in out/ by default (you can change this with the OUTDIR environment variable, OUTDIR=../web make, or directly in the Makefile).
make clean will remove the OUTDIR.
i use nginx on an arch linux server. if you don’t have a server, i’ve heard good things about neocities, you should be able to just upload the files created by this.