fix docker image issues

[jsladerman]

fixes two issues with the new dockerized version of the docs site:

• flashing and scroll resets on every nav, this was due to Next i18n not resolving routes correctly and causing every nav to be server-side instead of client-side where possible. this could likely be fixed with some additional refactoring and configurations, but it would add more complexity than necessary given that we don't actually use it at all. removing seems to fix the problem
• OpenGraph wasn't resolving, needed to add the NEXT_PUBLIC_ROOT_URL build arg

[linear]

PROD-3579 fix flashing ui on docs site docker image

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