Migrate to tracebloc 0.8.x: rename SDK page + URL + install snippets

[saadqbal]

Why

The SDK was renamed in tracebloc-py-package#135 — PyPI distribution and import path are now tracebloc (was tracebloc_package). tracebloc==0.8.1 is live on PyPI. Docs still reference the old name.

What

• Rename page tools-help/tracebloc-package.mdx → tools-help/tracebloc.mdx and update its content.
• Update docs.json:
  • Nav entry tools-help/tracebloc-package → tools-help/tracebloc.
  • Existing redirects with destination /tools-help/tracebloc-package → /tools-help/tracebloc.
  • Add a new redirect: /tools-help/tracebloc-package → /tools-help/tracebloc (preserve old inbound links).
• Internal links: /tools-help/tracebloc-package → /tools-help/tracebloc in tools-help/faqs.mdx and tools-help/key-terms.mdx.
• Install snippets: pip install tracebloc_package → pip install "tracebloc[pytorch]>=0.8.0" in tools-help/tracebloc.mdx and join-use-case/start-training.mdx.
• Import snippets: from tracebloc_package import X → from tracebloc import X.

Acceptance

• No tracebloc_package references in user-facing docs (except a historical note on the rename).
• /tools-help/tracebloc-package redirects to /tools-help/tracebloc (no broken inbound links).
• PR merged same-day with the 0.8.0 release coordination.