Deployments: Fix OIDC Setup Instructions

[Copilot]

This PR moves the OIDC setup pages from access-management/oidc/provider/ to deployments/oidc/ and updates their content to focus solely on Pulumi Deployments rather than trying to serve both Deployments and ESC in the same documentation.

Changes made:

• Renamed main page from "OpenID provider" to "OIDC Setup" to match the Deployments settings UI
• Moved and updated menu structure to place OIDC under Deployments navigation
• Removed ESC-specific content from all pages (AWS, Azure, GCP)
• Added info notes on each page that ESC should be the preferred approach
• Fixed links to refer to the new path locations
• Added aliases to ensure backward compatibility with old URLs
• Removed automation sections as they were out of date
• Added readme explaining the changes

The dedicated ESC OIDC setup documentation already exists in /docs/esc/environments/configuring-oidc/.

Fixes #15085.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.fwupd.org
  • Triggering command: /usr/bin/fwupdmgr refresh (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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