Revert PR #2085: Remove enhanced port documentation and package-lock.json from .gitignore

[Copilot]

This PR reverts the changes made in PR #2085 as requested in the issue.

Changes reverted:

.gitignore

• Removed package-lock.json entry that was added

how-to-guides/celestia-app.md

• Removed port 1317 from the port table
• Restored original simple table format with basic descriptions:
  • Port 2121: P2P
  • Port 9090: gRPC
  • Port 26657: RPC
• Removed entire "Understanding port exposure and security" section including:
  • "External exposure requirements" subsection
  • "App vs Core endpoint distinction" subsection
  • All detailed port descriptions and usage guidance

yarn.lock

• Minor dependency updates preserved for build stability

Verification:

• ✅ Build passes successfully (yarn build)
• ✅ Documentation restored to original simple format
• ✅ All enhanced content from PR docs: Explain necessary RPC to expose, and document it #2085 removed

The repository is now restored to its state before PR #2085 was merged.

Fixes #2136.

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[jcstein]

celestiaorg/celestia-app@ccccd87

[github-actions]

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2025-07-11 20:03 UTC