web server should be accessible from the browser

[amit-nagish]

Is your feature request related to a problem? Please describe.
If you deploy the web server, you can't make requests from another site to that web server, due to CORS.
Also, the payload is quite large due to repetitive JSON formatting.

Describe the solution you'd like
As the web server is read-only I think defaulting to allowing CORS & adding gzip is good.

Describe alternatives you've considered
Creating a proxy server to call wn.web, compress the data and send it to the client, but it just adds a layer of complexity.

[goodmami]

I'm not entirely convinced about the need for CORS in wn.web.app. I understand why you need it, but feel like these things should be configured by the person deploying the web app and not set as defaults in Wn.

Some alternatives:

• Have some wn.web.create_app() function that customizes an app object (e.g., create_app(..., allow_origins=['*']))
• Document internals like wn.web.routes and deployers can create app objects themselves (app = Starlette(routes=wn.web.routes, ...))
• Recommend using app.add_middleware(...)