docs(web): document remoteConfigUrl in web generator README

[nabsei]

Closes #898

Problem

remoteConfigUrl is a real web generator config option (default 'https://nodejs.org/site.json', set in src/generators/web/index.mjs), exposed via the #theme/config virtual module, and consumed by RemoteLoadableBanner.jsx → loadBanners.mjs to fetch announcement banner data. It was undocumented in src/generators/web/README.md.

Change

Added remoteConfigUrl to both tables it was missing from:

• The Configuring options table (name, type, default, description).
• The #theme/config Available exports table.

Docs only, no behavior change — matches the note in CONTRIBUTING.md that internal-docs-only changes don't need a changeset.

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Project	Deployment	Actions	Updated (UTC)
api-docs-tooling	Ready	Preview	Jul 12, 2026 8:43am

[cursor]

PR Summary

Low Risk
README-only documentation with no code or configuration behavior changes.

Overview
Documents the existing remoteConfigUrl web generator option in src/generators/web/README.md, which was already implemented and exposed via #theme/config but missing from the docs.

Adds a row to the Configuring table (type string, default 'https://nodejs.org/site.json', client-side fetch for remote site config / announcement banners) and a matching row under #theme/config Available exports (ties it to RemoteLoadableBanner). Table column alignment is widened slightly so the new descriptions fit.

Docs only — no runtime or build behavior changes.

^{Reviewed by Cursor Bugbot for commit 8831c1b. Bugbot is set up for automated code reviews on this repo. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.12%. Comparing base (0c53b50) to head (52c29d7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #899   +/-   ##
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  Coverage   85.12%   85.12%           
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  Files         180      180           
  Lines       16581    16581           
  Branches     1513     1513           
=======================================
  Hits        14114    14114           
  Misses       2457     2457           
  Partials       10       10           

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