* Drop .opacity-50 and .opacity-75 redefinition in examples
* Drop unused .card-img-right from blog example CSS files
* Use line-height utilities when possible
* Use rounded-* utilities in examples
* Replace .nav-underline by .nav-scroller and use it in examples.html default
* Use .mb-1 for .blog-post-title
* Remove unused CSS rule and use .fw-* utilities for carousels examples
* Use utilities for cheatsheet examples
* Extract some CSS to utilities for .nav-masthead .nav-link in cover example
* Dashboard group of minor modifications
* Dropdowns example: refactoring
* Dropdowns example refactoring: fix linting by removing selector by id
* Features example refactoring
* Headers example refactoring
* List groups example refactoring
* Sidebars example refactoring
* Sign-in example refactoring
* Starter template refactoring
* Fix RTL examples
Co-authored-by: Mark Otto <markd.otto@gmail.com>
