Add ... to dataset options

Update presets -> built-in

Use the external elvis-ui library

Improve styling

Replace usage with quickstart

Use nested dropdown menu

Use rounded borders for tabs and sidebar

Add cards for grouping

Add gray background over code in markdown

Fix Sidebar getting too big

Add preset datasets

Update usage to be more descriptive and use the same style as other visualizers

Add usage

Add download csv and svg option

Improve colors

Refactor frontend file structure