Chord Diagram: Refactoring, Docs, Examples

[reb-dev]

#97

[rokotyan]

@reb-dev Overall looks great! I've only left a few comments to the code.

[rokotyan]

@reb-dev Looks like we need to add an image to the Gallery example

[rokotyan]

@reb-dev Also there's a problem with labels alignment when radiusScaleExponent is not default:

Screen.Recording.2023-02-14.at.2.33.54.PM.web.mp4

[rokotyan]

@reb-dev One more thing, the fact that the links are being re-drawn every time the graph updates means that our component doesn't implement the enter-update-exit logic properly. We can fix that fairly easily by providing the second argument to the .data calls:

You can check how it's done for the Graph component and copy the code from there.