Update npm modules

Fix kriasoft#83: Externals setting for server-side bundle in webpack.…

…config.js

...also update browser-sync 2.5.2 > 2.5.3 and less 2.4.0 > 2.5.0

Add style-loader to client-side bundling configuration. Fixes kriasof…

…t#72

Update webpack.config.js

  - Add `url-loader` for `.svg` files
  - Fix `jest` preprocessor setting in `package.json`

Fix footer on the default page layout

Fix webpack.config.js for production build. Closes kriasoft#2

Fix deployment url