[REFACTOR] Refactor & comment document picker modal (#929)

* implement alternating color rows for file picker

* implement alternating colors for workspace directory

* remove unneeded props/variables

* remove unused border classes

* WIP new folder UI

* remove unneeded expanded prop from filerow component

* folder creation UI and files object manipulation WIP

* folder creation & moving files complete

* add developer API support for creating folders and moving files

* update alternating row css for file picker

* remove unneeded props from merge

* add comments to ManageWorkspace modal and switch flex direction on smaller screen sizes

* drop Legacy and remove transitions post-merge

* switch flex direction on document picker on smaller screen sizes + css fixes for my documents

* linting

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Co-authored-by: timothycarambat <rambat1010@gmail.com>