Update the documentation and examples wrt deploy and observablehq.config.ts

[mcglincy]

#634 moved the deploy section out of observablehq.config.ts, but docs and examples still need updating.

[mbostock]

We also need to remove the now-dead code out of config.ts.

framework/src/config.ts

Line 39 in a89079e

deploy: null | {workspace: string; project: string};

framework/src/config.ts

Line 105 in a89079e

deploy = deploy ? {workspace: String(deploy.workspace).replace(/^@+/, ""), project: String(deploy.project)} : null;

[mythmon]

I left that code in intentionally so that we could nicely migrate our EA users from the old config to the new one. It's not entirely dead yet, though I don't know how long of a migration period we should have.

[mbostock]

Fixed in #669 #678 dadc6b0.