[ QueryJane project ] Interface improvements in design and optimization for load time

This is my fourth collaboration in Query Jane project. In this time I'm going to show improvements about design interface and optimization from the browser side. The next were the tasks that were developed:

• Replace gulp for webpack as a module bundle, perfect to migrate to bootstrap 4.
• Migration from bootstrap 3 to bootstrap 4 for a better responsive for last devices and an easy maintenance of ui implementation.
• Using import with webpack for a better compilation in javascript.
• Optimization with webpack that let us to load only one file for css and only one file for js.

In order to migrate from bootstrap 3 to bootstrap 4 and improve the ui design, I added webpack because it is a module bundle that allow me to use imports for css and js, following the bootstrap 4 documentation and your specifications about [how to compile with webpack](https://getbootstrap.com/docs/4.1/getting-started/webpack/). Following those instructions that was a clear integration and allow me to apply styles using sass and create a theme that apply styles for modular elements like buttons, forms, cards etc., and use them to create quickly each interface with the right design.

Webpack let me to use only the methods that we need for our view and avoid to get all the js of a library, then it was a great improvement for performance because in the future we will reduce the size of all static files in our application. It let me reduce the request for static files too, because using import I called all files css and js that we need for each view.

The migration to bootstrap 4 allowed us to use one of the last updates of css, these are flex boxes. We can use new helpers that allowed to us get quickly modifications in the interface too.

With the use of imports for css and js, now we can get dependencies directly from node package modules and in the same way we can compile all files in only one file. With these configurations we can get great improvements in performance because we reduce the load time for a view.