Investigate issues and improve `Next.js 14+` scaffold projects configuration.

[shimkiv]

Related to:

• https://github.com/o1-labs/zkapp-cli/pull/652
• https://github.com/o1-labs/zkapp-cli/pull/656
• https://github.com/o1-labs/docs2/pull/970

[shimkiv]

More specifically we want to simplify the Next configuration by only leaving the headers config. https://github.com/o1-labs/docs2/blob/b8ac883d6bcebd657558cdbf50b346a95bf4e2c9/examples/zkapps/04-zkapp-browser-ui/ui/next.config.mjs#L25

[shimkiv]

Related issues:

• https://github.com/o1-labs/o1js/issues/1610
• https://github.com/o1-labs/o1js/issues/1576
• https://github.com/o1-labs/o1js/issues/1575

[shimkiv]

Related Discord messages:

• https://discord.com/channels/484437221055922177/1233356603424641025
• https://discord.com/channels/484437221055922177/1232630802031050783/1232630802031050783

[boray]

Shouldn't we label this issue as a bug?