docs: move all docs to https://github.com/MemTensor/MemOS-Docs

[Ki-Seki]

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[Copilot]

Pull Request Overview

This PR migrates all documentation to a dedicated repository, cleaning up local docs, tests, and build targets.

• Deleted local docs/ content and the YAML validation tests.
• Added a brief docs/README.md pointing to the new docs repo.
• Updated references in README.md and removed the docs target from the Makefile.

Reviewed Changes

Copilot reviewed 33 out of 37 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_docs.py	Removed tests for local documentation settings and validation.
docs/settings.yml	Deleted obsolete docs configuration.
docs/**	Removed all local markdown documentation files under docs/.
docs/README.md	Added notice directing readers to the external docs repository.
README.md	Updated asset paths for QR code and SOTA image.
Makefile	Removed docs target and updated .PHONY declarations.

Comments suppressed due to low confidence (3)

README.md:34

• The README now references docs/assets/qr_code.png but the asset file was not renamed or added in this PR. Please include the renamed file or update the link to match the existing filename.

    <a href="docs/assets/qr_code.png">

README.md:46

• The image source has been updated to sota_score.jpg; ensure that the file is present in docs/assets or correct the filename to match the actual asset.

    <img src="docs/assets/sota_score.jpg" alt="SOTA SCORE">