* initial stub files to support DocC generation
* add dependency on docc-plugin to support local previewing of documentation
* adding preview documentation commands to view documentation
* adding documentation generation commands
* cleanup with precommit
* update to reference expected location, or how to preview
* cleaning up documentation for global hashing algorithms
* adding documentation for ManagedContiguousArray
* adding documentation for UnorderedSparseSet
* directly porting README getting started into an Essentials article