Install Boot build tool: brew install boot-clj.
For JS people: Boot has a notion of tasks, so it's kind of similar to Grunt/Gulp.
build.boot is yours package.json and gulpfile.
ring-jetty-adapter provides Java's Jetty web framework, compojure is a routing library and hiccup is a lib for writing HTML. The task is defined using deftask macro, it runs run function which we :refer to.