refactor: build config (#408)

* refactor: build config

* chore: fix conflict

* fix: 404 page path

build/ssr.js

@@ -0,0 +1,34 @@
+var rollup = require('rollup')
+var buble = require('rollup-plugin-buble')
+var async = require('rollup-plugin-async')
+var replace = require('rollup-plugin-replace')
+
+rollup
+  .rollup({
+    input: 'packages/docsify-server-renderer/index.js',
+    plugins: [
+      async(),
+      replace({
+        __VERSION__: process.env.VERSION || require('../package.json').version,
+        'process.env.SSR': true
+      }),
+      buble({
+        transforms: {
+          generator: false
+        }
+      })
+    ],
+    onwarn: function () {}
+  })
+  .then(function (bundle) {
+    var dest = 'packages/docsify-server-renderer/build.js'
+
+    console.log(dest)
+    bundle.write({
+      format: 'cjs',
+      file: dest
+    })
+  })
+  .catch(function (err) {
+    console.error(err)
+  })