feat(ui): start Dapp Offer Up UI in Next.js

[gacogo]

Link to demo: https://dapp-offer-up-next-ui.vercel.app/

Changes:
The core Next.js components for Dapp Offer Up are located within the /next-ui directory. It's not currently added to workspace, so navigate to the directory and run yarn install.
App Router implementation: This UI leverages the new app router by nextjs

Important Notes:

Webpack issues and Live Reload: A potential Webpack configuration issue is preventing yarn dev and live reload functionality. To preview changes, please use the following workflow:

1. yarn build
2. yarn start

I'm actively investigating a solution for the expected development experience.

[dckc]

@samsiegart I haven't looked at this closely, but I wonder if it helps at all with our next.js integration challenges.
If nothing else, it shows interest :)

[samsiegart]

@dckc Yes it's a big help, would love to push this along more. I don't know if we necessarily want to switch this dapp to next, but maybe we could fork it into something like agoric-labs/dapp-nextjs or something