feat(website): replace the Cloud page with Paseo Hub

The Cloud page pitched a hosted multi-user product and collected emails
through a signup form. The Hub is a self-hosted service in private beta
and the only way in is a Discord DM, so the signup server function and
its webhook are deleted rather than repointed. /cloud now 301s to /hub
from the worker entry, which already owns the site's permanent path
redirects, so old links and search results keep working.

The homepage also drops split panels, service proxy, voice, and keyboard
shortcuts. They had turned the page into a feature list; it should show
what Paseo enables at a high level.

Brand and provider icons move into shared modules so the Hub page, the
site header, and the landing page each use one copy instead of three.

packages/website/src/llms.ts

@@ -60,7 +60,7 @@ ${agents}
 
 - [Changelog](${SITE_URL}/changelog): Release notes for the Paseo daemon, CLI, desktop, and mobile apps.
 - [Download](${SITE_URL}/download): Install Paseo on Mac, Windows, Linux, iOS, Android, or run the web app.
-- [Paseo Cloud](${SITE_URL}/cloud): Waitlist for the hosted multi-user version of Paseo.
+- [Paseo Hub](${SITE_URL}/hub): Optional service above your daemons that adds GitHub, Slack, and Discord triggers. Self-hosted, private beta.
 - [Blog](${SITE_URL}/blog): Updates and technical posts from the Paseo team.
 - [Privacy](${SITE_URL}/privacy): Privacy policy.
 - [GitHub](https://github.com/getpaseo/paseo): Source code, issues, and releases.