Updates bos-workspace and uses urbit web component

[elliotBraem]

This pull request uses latest bos-workspace, upgrades the gateway, and organizes the widget-gateway relationship to be more typical + familiar, removing:

• no bundling local widget code in final /dist
• using src instead of code, and using the dev tool
• no need for an "ExamplePage", the entire app should exist within the root widget, using a near account rather than "local.components")

Check out the pull request and follow the getting started -- either use yarn or pnpm:

pnpm install
pnpm run dev

It will automatically open the default gateway, defaulting to your local root widget (urbitlabs.near/widget/app), and is already hooked up to dev server.

I did a run through of the documentation and everything works up until "deploying the gateway" because I can't find the "Silo" app. Left comments in the documentation

• Hot reload for both components and the gateway for easy development of each
• Gateway is configured as near-bos-webcomponent <-- this is an important pivot in BOS ecosystem, see the Build Report from Peter
• bos-workspace uses custom gateway for easy integration, defaults to the index defined in bos.config.json (urbitlabs.near/widget/app)
• Organizes code using hooks
• Updates README and guide

Possible next steps for a better dev experience

• In "deploying gateway", remove the manual step of setting the src in <near-social-viewer />
• Replace urbit VM with default near-social-vm, and instead, create a <Urbit /> custom VM element; see "Configuring custom VM elements"