The classical ShellSort Algorithm. Works in O(n log n) time w/ non-stable sorting characteristics. ## Checklist - [ ] implementation - [ ] tests - [ ] jsdoc ## Specifics <!-- include any details of what you'd like this feature to include --> ## Notes <!--(optional)--> <!-- (optional) compile useful notes from the comments here --> ## References <!--(optional)--> <!-- add links to any relevant references here - [link-name](linkurl) - link description -->