fix(site): add --url to the homepage copy command

[lakhansamani]

Why

DEMO_COPY_COMMAND in components/Hero.tsx is the command visitors copy straight off the homepage. It omitted --url, which authorizerdev/authorizer#764 made required — so the first thing a new user runs exits immediately:

--url is required (e.g. --url=https://auth.example.com)
Why: without it the password-reset, email-verification and magic-link URLs, and the
JWT `iss` claim, are derived from request headers — so an attacker can have a victim
emailed a genuine reset link pointing at a domain the attacker controls.

That is the worst possible place for this bug: it is the landing page's single call to action.

Verified

Replayed the command exactly as rendered against a build of authorizermain — it now reaches the HTTP listener instead of exiting:

[GIN-debug] Running in "debug" mode.
[GIN-debug] GET / --> ...RootHandler

npx tsc --noEmit clean.

Note

The file already carries a comment saying "Keep this in step with docs.authorizer.dev/core/server-config" — that is exactly the drift that happened here, so it is worth treating this snippet as release-blocking whenever a required flag changes.

Companion fixes for the same root cause are in authorizer (README, MIGRATION, perf), authorizer-docs, examples, authorizer-go and the RAG demos.

Refs authorizerdev/authorizer#764

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