Reduce dependency from jQuery #89
Description
Until now jQuery is used in dx-ball in following processes
- Querying DOM.
- Event binding.
- Bootstrap's underlying usage (i.e modal)
We want to get rid of jQuery implementations. Scope of this task is to convert followings
- Instead of querying DOM using jQuery, use native javascript.
- Use javascript native event binding instead of jQuery.
Getting rid of the Bootstrap will be a big task itself.