padreug d8cc04f1b1 Add Geminox GBT wood boiler manual PDF ...

- Add original French manual as geminox-gbt-wood-boiler-manual.pdf
- Add documentation section with link to PDF in wood-fire-heater.md

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-04 23:58:14 +01:00

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