Fix some paths in the website build process.

website/build-examples.js

@@ -77,7 +77,7 @@ glob(srcPattern, function (err, files) {
       .transform(babelify)
       .transform(aliasify, {
         aliases: {
-          '@uppy': path.join(__dirname, '../packages/@uppy')
+          '@uppy': path.relative(process.cwd(), path.join(__dirname, '../packages/@uppy'))
         }
       })
 

website/update.js

@@ -5,7 +5,7 @@ var exec = require('child_process').exec
 var YAML = require('js-yaml')
 
 var webRoot = __dirname
-var uppyRoot = path.dirname(__dirname)
+var uppyRoot = path.join(__dirname, '../packages/uppy')
 
 var configPath = webRoot + '/themes/uppy/_config.yml'
 var version = require(uppyRoot + '/package.json').version