notebook: add docx→markdown converter for openwebui knowledge bases
- 000-configs/notebooks/docx_to_markdown_openwebui.ipynb (29 cells) - mammoth + python-docx fallback, manifest dedup (SHA-256), pre-flight fuzzy dedup (Jaccard @ 0.97), URL extraction, gzip download - 000-configs/notebooks/README.md: index of notebooks + how-to-add - 000-configs/README.md: list notebooks/ subfolder in the table - 07-tasks/docx-to-markdown-converter-notebook.md: full task writeup
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