Fix layout component logic

[wackerow]

Description

• fix: layout component set logic... Bug existed causing last set of custom components spread into an object to override everything else, causing the markdown components for the "tutorial" layout to be dominant.
• feat: update h2 styling; removes mono and uppercase font properties
• refactor: use tw classes for default bg and color in Codeblock component (semi-patches a small color-mode bug I'm seeing with the update to the components)

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[nloureiro]

@wackerow looks great ship it!!!

[pettinarip]

Nicee! LGTM

[wackerow]

Build failed before from "CardGrid" not being pass through for the "use-cases" template, which was previously masked because we spread them all together. Refactored a touch to grab the re-used custom styling <CardGrid className="grid grid-cols-[repeat(auto-fill,_minmax(min(100%,_280px),_1fr))] gap-8"> and just pass that from the UseCases template, converting in-markdown usage to <CardGrid>.. Built properly locally, Netlify going now... can pull in if successful.