feat(docs): replace docs sh script with node

scripts/docs-build.js

@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+
+var fs = require('fs')
+var marked = require('marked-man')
+var npm = require('../lib/npm.js')
+var args = process.argv.slice(2)
+var src = args[0]
+var dest = args[1] || src
+
+fs.readFile(src, 'utf8', function (err, data) {
+  if (err) return console.log(err)
+
+  var fileExt = src.split('.').pop()
+  var result = data.replace(/@VERSION@/g, npm.version)
+
+    if (fileExt === 'md') {
+      result = marked(
+        result.replace(/\-\-\-([\s\S]+)\-\-\-/g, '')
+          .replace(/(npm-)?([a-zA-Z\\\.\-]*)\(1\)/g, 'npm help $2')
+          .replace(/(npm-)?([a-zA-Z\\\.\-]*)\((5|7)\)/g, 'npm help $2')
+          .replace(/(npm-)?([a-zA-Z\\\.\-]*)\(3\)/g, 'npm apihelp $2')
+          .replace(/npm(1)/g, 'npm help npm')
+          .replace(/npm(3)/g, 'npm apihelp npm')
+          .trim()
+      )
+    }
+
+  fs.writeFile(dest, result, 'utf8', function (err) {
+     if (err) return console.log(err)
+  })
+
+})