docs(release): link epic web nx release course

[juristr]

• Updates the link-card component to allow pointing to images instead of just icons.
• Updates the docs to include a link to the Epic web nx release course:
  • https://nx-dev-git-docs-link-nx-release-course-nrwl.vercel.app/features/manage-releases
  • https://nx-dev-git-docs-link-nx-release-course-nrwl.vercel.app/recipes/nx-release/get-started-with-nx-release

[vercel]

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Name	Status	Preview	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	Feb 5, 2025 1:33pm

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☁️ Nx Cloud last updated this comment at 2025-02-05 13:34:11 UTC

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