Replace hijacked discord.gg/livepeer invite link

[rickstaa]

What happened

The discord.gg/livepeer vanity URL was hijacked — the server likely dropped below the boost count Discord requires to hold a custom vanity slug, and someone else claimed it. Every Discord link in these docs was sending readers to a server we don't control: the navbar Community anchor on all four nav variants, the footer social icon, the issue-template contact link, and ~90 content pages across v1/, v2/, and the localized cn/es/fr trees.

Follows up on livepeer/website#94, which fixed the same problem on livepeer.org.

What changed

All Discord references now point at https://discord.gg/55SZFEEH5y. This covers both hijacked forms of the vanity URL (discord.gg/livepeer and discord.com/invite/livepeer):

• docs.json + docs.json.jsx — the Community nav anchor (4 nav variants) and the footer Discord social link, kept in sync
• snippets/data/*/hrefs.jsx — the shared href tables for community, developers, gateways, and orchestrators
• .github/ISSUE_TEMPLATE/config.yml — the "Livepeer Discord" contact link
• contribute/CONTRIBUTING.mdx, snippet examples, and snippets/assets/data/protocol-overview.html
• ~90 content pages under v1/, v2/, and the cn/es/fr translations
• llms-full.txt and the tasks/context_data source files

99 files, 184 replacements.

Deliberately not changed

Historical audit artifacts keep the old URLs, since they record what was crawled at the time rather than what we publish:

• tasks/reports/navigation-links/LINK_TEST_REPORT.{json,md}
• tasks/reports/docs-usefulness/**/page-matrix.jsonl
• tasks/reports/quality-accessibility/**/page-matrix.jsonl
• v2/internal/reports/navigation-links/v2-link-audit.md

Verification

• git grep -E 'discord\.(gg/livepeer|com/invite/livepeer)' returns nothing outside those report artifacts
• docs.json and docs.json.jsx changed together, so a regenerate won't reintroduce the old link

For reviewers

• Please sanity-check the invite code 55SZFEEH5y against the real server before merging — it is the code used by Replace hijacked discord.gg/livepeer invite link website#94.
• Two other Discord URL shapes are still in the repo and were left alone because I can't confirm where they resolve: https://discord.com/invite/mnfGR4Fjhp and https://discord.livepeer.org/. Worth checking whether either redirects to the hijacked server.
• The docs-v3 branch already carries this fix for its own pages; this PR only touches main.

🤖 Generated with Claude Code

[github-actions]

📊 V2 Browser Sweep Results

❌ Test report not found. The test may have failed before report generation.

• Likely failed in setup/cache/server-start steps before npm run test:v2-pages.

[rickstaa]

Wrong base branch — reopened against docs-v3 as #995.