install packages

(e.g., ubuntu)
$ sudo apt install pandoc texlive-full python3-pyinotify

build

$ ./build.py
$ evince out-pdf/out.pdf

(e.g., watching file modification and building)
$ ./build.py -w

$ ./build.py --html
$ ./build.py --serve
$ firefox localhost:8000

document

src/header.md
src/[topic].md