Solo wallet is broken in current NPM packages

[michaelfig]

Describe the bug

#8533 solved this problem.

ag-solo's builtin web server was incorrectly configured. Dapps were trying to reach http://localhost:8000/wallet/bridge.html but no bridge connection would result.

To Reproduce

Steps to reproduce the behavior:

1. git clone https://github.com/Agoric/dapp-card-store -b mfig-hack-getting-started
2. Follow the README.md
3. Note that the card store UI spins forever

Expected behavior

Using the dapp would connect to the Solo and make progress in its UI.

Platform Environment

• what OS are you using? what version of Node.js?
• is there anything special/unusual about your platform?
• what version of the Agoric-SDK are you using? (run git describe --tags --always)

Additional context

It looks like the Solo's wallet bridge connection is stuck. Loading the http//localhost:8000/wallet/bridge.html page directly (as the network tab reveals the dapp is trying to do) doesn't show the "no user-servicable parts" bridge page, it shows the Solo wallet management UI. It looks like the web server is configured for a Single Page App, when in reality it's a Dual Page App.

Screenshots

I'm writing this from memory.