chore(app-pages-router): Put proxy in front of the server functions

[sommeeeer]

This PR will make examples/app-pages-router run locally. We put a proxy infront of the splitted server functions. Ended up using express-http-proxy. I also installed tsx so we can run that TypeScript file easily.

Depends on #964, #965, #966

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[conico974]

LGTM thanks

[sommeeeer]

Thanks Nico!