Fix urlpath in webpack build

Signed-off-by: Yukai Huang <yukaihuangtw@gmail.com>

public/views/includes/header.ejs

 <% for (var css in htmlWebpackPlugin.files.css) { %>
-<link href="<%= webpackConfig.output.baseUrl %><%= htmlWebpackPlugin.files.css[css] %>" rel="stylesheet">
+<link href="<%= '\<\%= serverURL \%\>'%><%= htmlWebpackPlugin.files.css[css] %>" rel="stylesheet">
 <% } %>

public/views/includes/scripts.ejs

 <script src="<%= webpackConfig.output.baseUrl %>/config"></script>
 <% for (var js in htmlWebpackPlugin.files.js) { %>
-<script src="<%= webpackConfig.output.baseUrl %><%= htmlWebpackPlugin.files.js[js] %>" defer></script>
+<script src="<%= '\<\%= serverURL \%\>'%><%= htmlWebpackPlugin.files.js[js] %>" defer></script>
 <% } %>