docs: promote console marketplace in README

[Jayant-kernel]

Fixes

Fixes kubestellar/kubestellar#3824

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Summary of Changes

• Adds a visible Marketplace CTA to the main Console README.
• Points users and contributors to kubestellar/console-marketplace for dashboards, card presets, and themes.
• Adds the marketplace to the docs index so it is easier to discover from contributor-facing docs.

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Changes Made

• Updated README.md with an "Extend with the Marketplace" section.
• Updated docs/README.md with marketplace links in key entry points and contributor docs.
• Kept this PR docs-only; no runtime code or card components were changed.

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Checklist

• I used a coding agent (Claude Code, Copilot, Gemini, or Codex) to generate/review this code
• I have reviewed the project's contribution guidelines
• New cards target console-marketplace, not this repo
• isDemoData is wired correctly (cards show Demo badge when using demo data) — not applicable, docs-only change
• I have written unit tests for the changes (if applicable) — not applicable, docs-only change
• I have tested the changes locally and ensured they work as expected
• All commits are signed with DCO (git commit -s)

[kubestellar-prow]

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[github-actions]

👋 Welcome to the KubeStellar community! 💖

Thanks and congrats 🎉 for opening your first PR here! We're excited to have you contributing.

Before merge, please ensure:

• ✅ DCO Sign-off — All commits signed with git commit -s (DCO)
• ✅ PR Title — Starts with an emoji: ✨ feature | 🐛 bug fix | 📖 docs | 🌱 infra/tests | ⚠️ breaking

📬 If you're using KubeStellar in your organization, please add your name to our Adopters list. 🙏 It really helps the project gain momentum and credibility — a small contribution back with a big impact.

Resources:

• 🖥️ KubeStellar Console — Try the live multi-cluster dashboard
• 📖 Console Docs — Installation, features, and architecture
• 🧩 Marketplace — Community extensions and cards
• 📚 Knowledge Base — Troubleshooting and how-tos
• 📖 Full Documentation | 🤝 Contributor Handbook | 💬 Slack

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🌟 ~~~~~~~~~~ 🌟

📬 If you like KubeStellar, please ⭐ star ⭐ our repo to support it!

🙏 It really helps the project gain momentum and credibility — a small contribution back with a big impact.

[Copilot]

Pull request overview

This PR updates the repository’s documentation entry points to promote the external kubestellar/console-marketplace repo as the home for community dashboards, card presets, and themes.

Changes:

• Adds an “Extend with the Marketplace” section to the main README.md.
• Adds marketplace links to the docs index (docs/README.md) to improve discoverability.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
README.md	Adds a Marketplace CTA section with links to the marketplace repo and its contribution guide.
docs/README.md	Adds marketplace links in both the “Key entry points” list and the contributor-facing docs table.

[Jayant-kernel]

@clubanderson I have some more small prs but is there nay specific issue that you want me to solve