* Revamp scrollspy to use IntersectionObserver
* Add smooth scroll support
* Update scrollspy.js/md
* move functionality to method
* Update scrollspy.js
* Add SmoothScroll to docs example
* Refactor Using `Maps` and smaller methods
* Update scrollspy.md/js
* Update scrollspy.spec.js
* Support backwards compatibility
* minor optimizations
* Merge activation functionality
* Update scrollspy.md
* Update scrollspy.js
* Rewording some of the documentation changes
* Update scrollspy.js
* Update scrollspy.md
* tweaking calculation functionality & drop text that suggests, to deactivate target when wrapper is not visible
* tweak calculation
* Fix lint
* Support scrollspy in body & tests
* change doc example to a more valid solution
Co-authored-by: XhmikosR <xhmikosr@gmail.com>
Co-authored-by: Patrick H. Lauke <redux@splintered.co.uk>
