Removing Bootstrap from dependency

[ChathuraGH]

Proposed Functionality

You have removed jquery dependency, and that is great.
But Bootstrap is more disruptive than jquery. Because Bootstrap has not only js, but css.

I was using my own styling (css) first. But when I added this comment plugin, it changed my site styles(outside of this plugin) because it had bootstrap.

Use Case

1. it will load more faster
2. you can remove both js and css of bootstrap
3. you could remove bootstrap loading template tag from django code, templates

Changes

Moving only actively applying bootstrap css code to comment.css

I can create a pull request if you want.