Reimplement Vercel + Custom Server template

[brookslybrand]

See #82

The Vercel team has a React Router preset that works out of the box

However, previously our template showed how to run a custom template using express on Vercel, which might still be valuable to some users.

I believe they are working on fixing the regression. When that happens we can add the Vercel template back.

Or if someone wants to figure out another way to run express on Vercel and add a template that'd be cool too

[sigma-andex]

There is some info on custom server with hono on the vercel docs. I created a repo with this information and got it working on vercel. However I'm not able to get it running with the server andAppContext locally.
Is there a simpler way to get react router with an AppContext running on vercel without having to resort to a custom server?

[brookslybrand]

Nice @sigma-andex! That looks really promising

Would you be down to open up a PR to this repo and we can get it in? Mostly just need to match the format of all the others and add basic tests