fix(docs): hide overview ruler column in code editor

[sean-perkins]

Description

The monaco code editor in the playground shows a small gray border where the overview ruler is.

This PR disables that canvas element (border) from rendering:

Documentation for overviewRulerLanes option is available here: https://microsoft.github.io/monaco-editor/docs.html#interfaces/editor.IStandaloneEditorConstructionOptions.html#overviewRulerLanes

I believe this is the intended visual display based on the vertical scrollbars being hidden. I'm not sure why the production site is not capitalizing the dropdown text for "jsx" vs. "Jsx" as seen in the screenshots, but that is outside of the scope of my changes.

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Latest commit: fe48c5bc043f2d1b9ed5be82dc4c93293680cd0d

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