docs: bump Go to 1.24+, fix develop branch note, refresh CLI help

[imitater-dou]

Summary

Tip-verified README drift against develop @ 203bb9659eea613caefd198c67df4c6a8e6bf5d6:

1. Go version — README said Go 1.18+; go.mod declares go 1.24.0 and CI uses ^1.24.
2. Branch name — README claimed docs track main, but that branch does not exist (default is develop; releases use stable).
3. CLI help dump — hand-maintained -help text still listed separate -relay / -relays flags and omitted genesis-timestamp and request-max-retries. Regenerated from ./mev-boost -help built at tip; clarified that --relay / --relays are aliases.
4. Ethstaker relay list — remyroy/ethstaker path soft-redirects to an archived guides repo; point the primary link at the live https://ethstaker.cc/mev-relay-list/ page.

Repro

# Go claim
curl -sL https://raw.githubusercontent.com/flashbots/mev-boost/develop/go.mod | head -3
# → go 1.24.0

# main branch missing
gh api repos/flashbots/mev-boost/branches/main
# → 404

# CLI help at tip
git clone --depth 1 --branch develop https://github.com/flashbots/mev-boost.git
cd mev-boost && CGO_ENABLED=0 go build -o mev-boost ./cmd/mev-boost
./mev-boost -help | grep -E 'genesis-timestamp|request-max-retries|relays'

Test plan

• Diff is README-only
• Help dump matches local ./mev-boost -help at tip
• Ethstaker primary URL returns HTTP 200

[Copilot]

Copilot review overview

🟡 Changes recommended

Correct the README TOC anchor for the relay heading.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 1

Open (1)

• Fix TOC link to use the correct generated heading anchor · New

What changed in this PR

Updates README documentation for Go 1.24+, branch naming, CLI help, and relay resources.

Changes:

• Updates Go, branch, and Ethstaker relay-list references.
• Refreshes CLI help and clarifies relay flag aliases.
• Fixes documentation alignment with current project behavior.

The README TOC contains a link to a nonexistent relay heading anchor and requires correction.

File	Summary
README.md	Updates project and CLI documentation.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.