Docs: 2nd level nav arrows change ui

[enesinan]

What kind of change does this PR introduce?

Bug fix

What is the current behavior?

https://github.com/supabase/supabase/issues/10628

What is the new behavior?

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[MagnusHJensen]

This is no longer a valid PR due to the new next-js docs.

[saltcod]

Thanks @enesinan for the PR. This one is no longer relevant with the Docs site redesign. Appreciate the PR all the same!