docs(solidity-resources): drop dead LearnWeb3 link

[alexander-sei]

Resolves every open broken-external-links report: #52, #63, #70, #73. All four point at evm/solidity-resources.mdx and between them name two URLs.

What is the purpose of the change?

Delete a stale link to a service that no longer exists, and close out the tracking issues.

Describe the changes to the documentation

Removed the "Ethereum Developer Degree by LearnWeb3" entry (https://learnweb3.io) from the Basic Solidity list. The link has failed every weekly run since 2026-08-03 (502 in #52, 503 in #70 and #73), and it is not a transient outage:

• The host answers HTTP 503 with x-render-routing: suspend and a body of "This service has been suspended" — Render's response for a suspended deployment. Same result for /, /degrees/, and the degree page itself, with and without a browser user agent.
• The LearnWeb3DAO GitHub org has had no pushes since August 2025 and still lists the dead domain as its homepage.
• No successor domain exists. learnweb3.xyz responds but is an unrelated "airdrops / make money in web3" landing page, not the education platform. learnweb3.com / .dev don't resolve.
• Wayback's last successful capture is 2026-08-10.

Sending readers to a "Service Suspended" page is worse than not listing it. The section keeps four live resources (CryptoZombies, Solidity by Example, and two Cyfrin Updraft courses). Nothing else on the page references LearnWeb3.

Left the VS Code Marketplace link as is. #63 flagged marketplace.visualstudio.com/items?itemName=NomicFoundation.hardhat-solidity with a 503 on 2026-08-17. That was a one-off: it passed the 2026-08-31 and 2026-09-07 runs, returns 200 on GET (lychee's method) today, and the page body identifies PublisherName: NomicFoundation / ExtensionName: hardhat-solidity, so it isn't a soft 404. Not adding it to the lychee exclude list either — it's being checked successfully, and excluding it would hide real rot if the extension is ever renamed or unpublished.

Notes

Verification — lychee 0.24.2 with the repo's lychee.toml, same args as external-links.yml:

🔍 Total.........1034
🔗 Unique.........598
✅ Successful.....497
🔀 Redirected......75
👻 Excluded.......537
🚫 Errors...........0

This morning's scheduled run reported 1035 / 599 / 1 error; the one-link difference is the removed URL.

llms-full.txt still contains the old line, but per AGENTS.md it is generated, not hand-edited — the weekly regenerate-llms.yml job will pick this up.

Closes #52
Closes #63
Closes #70
Closes #73

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[cursor]

PR Summary

Low Risk
Documentation-only removal of a dead external link with no product or security impact.

Overview
Removes the Ethereum Developer Degree by LearnWeb3 bullet from the Basic Solidity list in evm/solidity-resources.mdx because https://learnweb3.io is permanently suspended (503 / “service suspended”), not a temporary outage.

The page still lists four beginner resources (CryptoZombies, Solidity by Example, and two Cyfrin Updraft courses). No other edits on the page; this clears broken-link checks tied to that URL.

^{Reviewed by Cursor Bugbot for commit 50054f0. Bugbot is set up for automated code reviews on this repo. Configure here.}

[seidroid]

A clean, well-evidenced 2-line docs removal of a dead LearnWeb3 link from evm/solidity-resources.mdx, with sound reasoning for leaving the VS Code Marketplace link untouched. No correctness, security, or style issues; the only notes are the stale copy in the generated llms-full.txt (self-resolving) and the fact that both second-opinion review passes produced no output.

Findings: 0 blocking | 5 non-blocking | 0 posted inline

Blockers

• None at the file/PR level.

Non-blocking

• Both second-opinion passes produced no output: codex-review.md (OpenAI Codex) and cursor-review.md (Cursor) are empty (1 byte each), so this review reflects only my own pass. REVIEW_GUIDELINES.md is also empty, so no repo-specific standards could be applied.
• llms-full.txt:16921 still contains the removed LearnWeb3 entry. This is correct to leave alone — AGENTS.md:51 states the file is generated by scripts/generate-llms.mjs and says "do not hand-edit the generated .txt files." One caveat worth knowing: that script fetches each page's .md from the deployed site, so the weekly regenerate-llms.yml run will only drop the line after this PR is merged and deployed. If the timing matters, trigger the job via workflow_dispatch post-deploy rather than waiting a week.
• Agreed with the decision not to add marketplace.visualstudio.com to the lychee.toml exclude list. That list is scoped to local/example hosts and domains that hard-block automated requests; a URL that is currently returning 200 doesn't belong there, and excluding it would mask genuine rot if the extension is later renamed or unpublished.
• I could not independently re-verify the live HTTP status of learnweb3.io from this environment (no outbound network access). The verdict rests on the evidence in the PR description — 502/503 across four consecutive weekly runs, the x-render-routing: suspend header indicating a suspended Render deployment, and no successor domain — which is thorough and internally consistent.
• Nit, pre-existing and out of scope: line 12 of evm/solidity-resources.mdx misspells "Solidity" as "Soldity". Not introduced by this PR, but it is two lines from the edit if you want a drive-by fix.