Doc styling improvements

[ellen-octopus]

In addition to the following component improvements, I've introduced proper foundational tokens that are inline with the product. These will eventually supersede the existing tokens.

Images

- Removed internal padding – this was making the image smaller

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Code snippet

- Applied styling to mimic the product

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Code block

- Applied border to differentiate between code block and background - Applied proper colour tokens to the copy icon

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Tables

• General styling improvements

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Tabs

• General styling improvements

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Callouts

• Applied proper colour tokens for dark theme

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[tonykelly-octopus]

Adding @KMajkrzakOctopus to the thread as he owns this space from the Web Team perspective