docs: agent & developer onboarding improvements (RPC discoverability, quickstarts, tx fix)

[alexander-sei]

Summary

Improvements surfaced by an AI-agent scan of the docs. The recurring theme was that key information (RPC endpoints) was only available inside JavaScript widgets — invisible to non-JS readers and AI agents — plus one runnable-code bug.

What's changed

Discoverability

• learn/dev-chains — EVM RPC, WebSocket, and explorer endpoints are now listed in plain text alongside the existing "add to wallet" widgets.
• evm/index — the RPC-selector iframe is replaced with a native endpoint table (official + community endpoints, per network), readable without executing JavaScript.
• docs.json — /learn/getting-started and /evm/getting-started (common guessed URLs that 404'd) now redirect to /learn.

Correctness

• evm/transactions — the only end-to-end "send a transaction" sample used web3.eth.getAccounts() + eth_sendTransaction, which public RPC endpoints don't support (they don't expose node-managed accounts), so it couldn't run as written. Replaced with local signing (privateKeyToAccount → signTransaction → sendSignedTransaction) using current web3.js v4 APIs.

Completeness

• evm/evm-parity/examples/ethers-quickstart & viem-quickstart — each read example now shows expected stdout ("You're done when you see…"), labels the credential-free read path as the first milestone, and adds a short Python (web3.py) snippet since Sei is EVM-compatible.
• evm/building-a-frontend — the contract-deploy prerequisite is now linked inline where TOKEN_CONTRACT_ADDRESS is introduced (Hardhat / Foundry / wizard).

Testing

• mint broken-links passes.
• All changed pages compile and render under mint dev.

All endpoint values and chain IDs are taken verbatim from the existing network widgets / llms.txt.

🤖 Generated with Claude Code

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[cursor]

PR Summary

Low Risk
Documentation and redirect-only changes; no application code, auth, or on-chain behavior.

Overview
This PR improves developer and agent onboarding by surfacing network and RPC details in plain text and fixing a misleading transaction sample.

Discoverability: learn/dev-chains now lists EVM RPC, WebSocket, and explorer URLs for mainnet and testnet. On evm/index, the RPC-selector iframe is replaced with mainnet/testnet endpoint tables (official and community URLs, rate limits), plus links to dedicated RPC providers and running a node. docs.json adds permanent redirects from /learn/getting-started and /evm/getting-started to /learn.

Correctness: The web3.js example in evm/transactions no longer uses getAccounts / eth_sendTransaction (unsupported on public RPC). It documents local signing with web3.js v4, chainId, and sendSignedTransaction, with an Info callout explaining the limitation.

Quickstarts & guides: Ethers and viem quickstarts add a no-key read milestone, expected stdout, faucet notes for sends, and a short web3.py section. The frontend guide links deploy paths (Hardhat, Foundry, wizard) where TOKEN_CONTRACT_ADDRESS is introduced.

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