[ DO NOT MERGE ] - Add side quest for lineage training

[luisas]

Summary

Adds a new side quest covering Nextflow's data lineage feature.

• New side quest at docs/en/docs/side_quests/lineage/index.md (785 lines) covering:
  • Enabling lineage tracking via lineage.enabled = true in nextflow.config
  • Exploring records with the nextflow lineage CLI (list, view, find, render, diff)
  • The three record types: WorkflowRun, TaskRun, and FileOutput
  • Why the output {} block is required for file-level provenance tracking
  • Comparing two workflow runs with nextflow lineage diff
• Example Nextflow pipeline in side-quests/lineage/ (same Hello Nextflow logic, extended with output {} and lineage config) including pre-generated .lineage/ store for reference
• Added lineage side quest entry to docs/en/docs/side_quests/index.md and mkdocs.yml nav

🤖 Generated with Claude Code

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