docs: document the backup/restore ZIP archive format

[irfanuddinahmad]

Summary

• Adds docs/openedx_content/backup_restore.rst — a full reference page for the TOML-based ZIP format produced by lp_dump / create_zip_file and consumed by lp_load / load_learning_package.
• Covers archive layout, all TOML file schemas with field-level descriptions, annotated examples drawn from the test fixtures, XBlock XML placement, and quick-start snippets for both management commands and the Python API.
• Links the new page from docs/openedx_content/index.rst.

Closes #492

Test plan

• cd docs && make html (or make dirhtml) — confirms RST renders without Sphinx warnings
• Spot-check that the TOML examples match the test fixtures under tests/openedx_content/applets/backup_restore/fixtures/library_backup/
• Run lp_dump on a real library and compare the output ZIP layout to the documented structure

🤖 Generated with Claude Code

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[Copilot]

Pull request overview

This PR adds official documentation for the ZIP-based learning-package backup/restore format used by the backup_restore applet, and links it into the openedx_content docs section so operators and developers can understand and inspect archives produced/consumed by lp_dump / lp_load.

Changes:

• Add a new reference page documenting the archive layout and TOML/XML schemas used in backup ZIPs.
• Include export/restore quick-start examples for both management commands and the Python API.
• Link the new page from the docs/openedx_content index.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 7 comments.

File	Description
docs/openedx_content/index.rst	Adds the new backup/restore format page to the openedx_content docs toctree.
docs/openedx_content/backup_restore.rst	New documentation page describing the backup ZIP layout and file formats.

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[irfanuddinahmad]

Fixed. Updated the section heading to: "library data (restored to the database, with caveats: key may be overridden by the caller and updated is not applied during restore)".