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Li Liu 00aac28c46 doc: reorganize repository documentation (#52489)
## Summary

- add simple rules for the repository documentation directories
- archive superseded Milvus 2.0 developer, Segcore, Jaeger, and Milvus
2.5-2.6 load-pipeline material
- remove only the standalone repository-local `docs/user_guides/` copies
- preserve existing Design Doc topic folders and supporting material,
including `cdc/` and `qviews/`
- move Design Docs and build/developer assets into their owning
directories
- remove the obsolete mutable-columns prototype and update the Design
Doc so it no longer depends on the deleted evidence
- update consumers of every moved path

This PR contains no `.github`, Mergify, approval-policy, checker, or
workflow changes.

## Verification

- searched the repository for `docs/user_guides`, `user_guides/`, and
deleted guide basenames: no stale consumers remain
- verified `docs/design-docs/design_docs/cdc/` and `qviews/` remain
unchanged
- audited changed Markdown links and anchors: no deletion-introduced
broken local targets
- `git diff --check`

The scheduled Markdown-link workflow is unchanged.

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Signed-off-by: Li Liu <[email protected]>
2026-08-16 06:04:23 +08:00
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