fix: use proper datetime to fix server-side/client-siode mismatch

[ovflowd]

Description

This PR fixes two issues on the Node.js Website related to rendering.

• The first issue is caused due to server-side/client-side Date rendering mismatch since the formatting function used is timezone-based. We updated the rendering of the time HTML elements by using JavaScript's built-in toLocaleString function. We've forced a UTC timezone and use en-GB locale information.
• The second issue is caused when the MDX-generated contents are identical, and the comparison of the theme.tsx memoization asserts both props as being the same as the comparison only used the MDX content as a comparison, excluding other props such as frontmatter. This should fix Next.js, not "moving" to another page. (The issue is that a re-rendering would not occur).
• This PR also removes the strftime package and utilities that are not used anymore.

Fixes #5478

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Name	Status	Preview	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	Jul 7, 2023 4:28pm
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[bmuenzenmeyer]

Confirmed in the preview that the behavior reported within #5478 is resolved

[ovflowd]

@bmuenzenmeyer Could you maybe open an issue regarding we providing a generic Component for the <time> element?

The component should have two props: date, which should be a string or Date object and the second one. corresponding to the shape of https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat#options

The component should return a time element, with the DateTime formatted on the currently applied locale (so the component must use useLocale hook).

[ovflowd]

@bmuenzenmeyer on the above, if you feel like you can introduce a component quickly enough, no need to open an issue if you feel like doing it. Shouldn't take enough time.

And this would allow the formatted times to actually be shown in the language/date format of the currently applied locale.