chore: remove private transaction content

[noam-alchemy]

Summary

• delete private transaction tutorial assets and references from navigation
• remove private transaction JSON-RPC entries from the Ethereum API tables
• strip private transaction endpoint mentions from pricing and batch request docs

Testing

• not run (not requested)

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https://chatgpt.com/codex/tasks/task_b_68d59945c4e08327977e8def9a6e148b

[Copilot]

Pull Request Overview

This PR removes all private transaction functionality from the documentation and API specifications. It involves deleting private transaction tutorial assets, navigation references, JSON-RPC method definitions, pricing information, and batch request documentation.

• Delete eth_sendPrivateTransaction and eth_cancelPrivateTransaction method definitions from OpenRPC specifications
• Remove private transaction tutorial files and navigation links
• Clean up pricing documentation and batch request references to private transaction endpoints

Reviewed Changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/openrpc/chains/eth/eth.yaml	Remove references to private transaction methods
src/openrpc/chains/_components/custom/methods.yaml	Delete complete method definitions for private transaction endpoints
src/openrpc/alchemy/token/token.yaml	Delete entire file containing private transaction API specification
fern/tutorials/transactions/sending-transactions/sending-transactions.mdx	Remove navigation links to private transaction tutorials
fern/tutorials/transactions/sending-transactions/how-to-cancel-a-private-transaction-on-ethereum.mdx	Delete complete tutorial file
fern/docs.yml	Remove redirect entries for private transaction endpoints
fern/api-reference/pricing-resources/resources/batch-requests.mdx	Update batch request documentation to remove private transaction references
fern/api-reference/pricing-resources/pricing/compute-unit-costs.mdx	Remove compute unit costs for private transaction methods
fern/api-reference/node-api/chain-apis-overview.mdx	Remove private transaction endpoints from API table

Comments suppressed due to low confidence (1)

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