feat(data): add Telemetry Tracker as an open-source Sentry alternative

[unjica]

What does this PR do?

Adds Telemetry Tracker as an open-source alternative to Sentry (Monitoring). It's an MIT-licensed error tracker with grouped errors, source maps, releases and alerts, plus events, sessions and Web Vitals. It can be self-hosted (Fastify API, Next.js dashboard, PostgreSQL; Docker Compose for Postgres and a deployment guide) or used via an optional free hosted plan. The cons list its JS/TS-only SDK coverage and its small community.

Disclosure: I'm the author.

Related Issues

N/A

Checklist

• I've read the CONTRIBUTING.md guide.
• If this adds a new tool, it includes the required schema fields, notably id, name, type, url, open_source_url. (Uses the same fields as existing entries: slug, name, category, website, github_repo.)
• If this updates docs, the changes are written in MDX to match existing docs in docs/app/deploy/. (N/A, data only)
• This maintains a neutral, fact-based tone when making pros/cons edits.

data/tools.json passes jq empty and the slug is unique.