Use npm script

This is more concise, and usable without docker

Makefile

@@ -4,4 +4,4 @@ node_modules: yarn.lock package.json
 	$(NODE) node yarn install
 
 start_the_show: node_modules
-	$(NODE) -p $(LOCAL_PORT):8000 --name sflive node /bin/sh -c 'node_modules/reveal-md/bin/cli.js --port 8000 --theme=solarized'
+	$(NODE) -p $(LOCAL_PORT):8000 --name sflive node /bin/sh -c 'npm start'

package.json

@@ -7,5 +7,8 @@
   "private": true,
   "dependencies": {
     "reveal-md": "^1.1.3"
+  },
+  "scripts": {
+      "start": "reveal-md --port 8000 --theme=solarized"
   }
 }