allow the server to be installed as an executable

package.json

@@ -33,6 +33,7 @@
     "express": "^4.17.1",
     "sqlite3": "^4.2.0"
   },
+  "bin": "./server.js",
   "engines": {
     "node": ">=10.19.0"
   }

server.js

@@ -1 +1,2 @@
+#!/usr/bin/env node
 require('./index.js');