Fix 16 broken internal and external documentation links

[Copilot]

Link checker identified 16 broken links across internal paths, external documentation, repository references, and third-party services.

Changes

Internal paths (2)

• /operate/data-availability/light-node → /operate/data-availability/light-node/quickstart
• /build/rpc/node-api/?version=v0.28.4#blob.Submit → /build/rpc/node-api

celestia-app documentation (6)

• Removed /specs/ path segment from celestiaorg.github.io URLs (namespace.html, shares.html)
• Updated x/blobstream references to orchestrator-relayer repository (module was disabled in v2)
• Fixed shares.md path: specs/src/specs/shares.md → specs/src/shares.md

Installation scripts (3)

• Changed script downloads from raw GitHub URLs to docs.celestia.org domain
• Updated GitHub repository links from /tree/main/ to /blob/main/

Third-party tools (1)

• golangci-lint: /usage/install/ → /docs/welcome/install/

Contract references (1)

• blobstream-contracts: blob/master → blob/v3.0.0

Removed unavailable services (4)

• cosmoslist.co endpoints (fetch failures)
• stake-town.com snapshot links (500 errors)

Files Modified

10 MDX files across build, learn, and operate documentation sections.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

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

• docs.celestia.org
  • Triggering command: /usr/bin/curl curl -sI REDACTED (dns block)
• golangci-lint.run
  • Triggering command: /usr/bin/curl curl -sI REDACTED (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 the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>fix: broken links</issue_title>
<issue_description>```
=== LINK CHECK SUMMARY ===

Total Links: 590
Internal: 180 (Broken: 2)
External: 390 (Broken: 14)

--- Broken Internal Links ---
[Route not found] /operate/data-availability/light-node (in app/build/blobstream/integrate-offchain/page.mdx)
[Route not found] /build/rpc/node-api/?version=v0.28.4#blob.Submit (in app/build/blobstream/integrate-offchain/page.mdx)

--- Broken External Links ---
[ERR - fetch failed] https://cosmoslist.co/testnet/celestia (in app/operate/networks/mocha-testnet/page.mdx)
[ERR - fetch failed] https://cosmoslist.co/mainnet/celestia (in app/operate/networks/mainnet-beta/page.mdx)
[500 - Internal Server Error] https://services.stake-town.com/home/testnet/celestia/sync (in app/operate/maintenance/snapshots/page.mdx)
[500 - Internal Server Error] https://services.stake-town.com/home/mainnet/celestia/sync (in app/operate/maintenance/snapshots/page.mdx)
[404 - Not Found] https://github.com/celestiaorg/docs/tree/main/public/celestia-node.sh (in app/operate/data-availability/install-celestia-node/page.mdx)
[404 - Not Found] https://github.com/celestiaorg/docs/tree/main/public/celestia-app.sh (in app/operate/consensus-validators/install-celestia-app/page.mdx)
[404 - Not Found] https://github.com/celestiaorg/celestia-app/tree/main/x/blobstream (in app/operate/blobstream/relayer/page.mdx)
[404 - Not Found] https://github.com/celestiaorg/celestia-app/tree/main/x/blobstream (in app/operate/blobstream/orchestrator/page.mdx)
[404 - Not Found] https://golangci-lint.run/usage/install/ (in app/operate/blobstream/install-binary/page.mdx)
[404 - Not Found] https://github.com/celestiaorg/celestia-app/tree/main/x/blobstream (in app/operate/blobstream/install-binary/page.mdx)
[429 - Too Many Requests] https://github.com/celestiaorg/blobstream-contracts/blob/master/src/Blobstream.sol (in app/learn/blobstream/page.mdx)
[404 - Not Found] https://celestiaorg.github.io/celestia-app/specs/namespace.html (in app/build/blobstream/integrate-offchain/page.mdx)
[404 - Not Found] https://celestiaorg.github.io/celestia-app/specs/shares.html (in app/build/blobstream/integrate-offchain/page.mdx)
[404 - Not Found] https://github.com/celestiaorg/celestia-app/blob/main/specs/src/specs/shares.md (in app/build/blobstream/integrate-offchain/page.mdx)

❌ Found 16 broken links

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes fix: broken links #2371

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