Fix: homepage code example RTL layout

[wackerow]

Description

• Forces entire mobile Accordion to dir="ltr" to keep loading skeleton and copy button positioned correctly
• Forces desktop loading skeleton to dir="ltr", and forces desktop copy button to right- instead of end- since the code will always be ltr (so we don't want the copy button to move to the left, even on rtl locales)
• Updates ui/accordion to use ChevronNext (direction responsive form of MdChevronRight), and adds rotate tailwind class to reverse rotation direction if rtl direction is inherited.

Preview link

https://deploy-preview-14044--ethereumorg.netlify.app/ur/

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