fix webpack resolve paths (#592)

server/build/webpack.js

@@ -49,7 +49,6 @@ export default async function createCompiler (dir, { dev = false, quiet = false
   }
 
   const nextNodeModulesDir = join(__dirname, '..', '..', '..', 'node_modules')
-  const appNodeModulesDir = join(dir, 'node_modules')
   const minChunks = pages.filter((p) => p !== documentPage).length
 
   const plugins = [
@@ -188,7 +187,7 @@ export default async function createCompiler (dir, { dev = false, quiet = false
     resolve: {
       modules: [
         nextNodeModulesDir,
-        appNodeModulesDir
+        'node_modules'
       ].concat(
         (process.env.NODE_PATH || '')
         .split(process.platform === 'win32' ? ';' : ':')
@@ -198,7 +197,7 @@ export default async function createCompiler (dir, { dev = false, quiet = false
     resolveLoader: {
       modules: [
         nextNodeModulesDir,
-        appNodeModulesDir,
+        'node_modules',
         join(__dirname, 'loaders')
       ]
     },