docs: switch install to extras syntax for tracebloc_package 0.6.33

[LukasWodka]

⚠️ Draft — do not merge until tracebloc_package 0.6.33 ships to PyPI

Currently 0.6.33 is only on TestPyPI. If this PR merges before the prod release, pip install "tracebloc_package[pytorch]>=0.6.33" will fail with "Could not find a version that satisfies the requirement".

Summary

Updates the start-training install instructions to use the new optional dependency groups shipping in tracebloc_package 0.6.33. Default install no longer bundles every ML framework — users pick the extra that matches their setup.

Changes

File	Change
README.md	Replace single pip install tracebloc_package>=0.6.32 with 3-line extras table (pytorch / tensorflow / all)
notebooks/traceblocTrainingGuide.ipynb (cell 3)	!pip install tracebloc_package>=0.6.32 -q → !pip install "tracebloc_package[pytorch]>=0.6.33" -q with comment pointing at TensorFlow and [all]

Why pytorch as default

• ~80%+ of tracebloc use cases today use PyTorch
• PyTorch is already pre-installed in Google Colab T4 runtime, so pip install "tracebloc_package[pytorch]" on Colab adds only the SDK itself + a few small deps
• TensorFlow and [all] are documented as one-character substitutions in the comment

Merge coordination

Same-day merge required with:

• tracebloc/tracebloc-py-package@v0.6.33 going live on real PyPI
• tracebloc/docs PR for the Mintlify setup guide
• tracebloc/tracebloc-website-main PR for the homepage quick-start snippet

Note about the diff

The NotebookEdit tool re-serialized the .ipynb, which expanded unicode escapes (\u2705 → ✅) throughout. Those lines are visual no-ops — only cell 3 has functional changes.

Test plan

• After 0.6.33 ships to PyPI, run the Colab notebook end-to-end: install cell → login → upload → link → start
• Run the local quickstart from README (step-by-step)
• Confirm install time drops from 10-15 min to ~2 min on Colab T4

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