fix: remove deprecated DocumentJoiner and OutputAdapter from 8 tutorials

[vominh1919]

Fixes #433

Haystack v2.24.0 made DocumentJoiner, OutputAdapter, and ListJoiner largely unnecessary — pipelines now natively support connecting multiple outputs to a single input for compatible list types.

Changes

Removed deprecated components from 8 tutorials:

1. Tutorial 30 — Removed DocumentJoiner, converters connect directly to document_cleaner
2. Tutorial 32 — Removed DocumentJoiner, retrievers connect directly to prompt_builder
3. Tutorial 33 — Removed DocumentJoiner from header text (code already didn't use it)
4. Tutorial 41 — Removed DocumentJoiner, routers connect directly to retrievers
5. Tutorial 43 — Removed OutputAdapter, using direct converter.documents mapping
6. Tutorial 44 — Removed DocumentJoiner from 3 SuperComponent definitions
7. Tutorial 46 — Removed DocumentJoiner, embedders connect directly to writer
8. Tutorial 48 — Removed OutputAdapter, using direct llm.replies -> message_writer.messages

Files Changed

• 8 .ipynb files modified

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