docs: add demo URL and preview & update head

[Moskize91]

No description provided.

[coderabbitai]

Summary by CodeRabbit

Release Notes

• Documentation

  • Updated project documentation with enhanced content emphasizing bilingual EPUB output capabilities and online demo features.
  • Added Chinese localization for README with bilingual-focused presentation.

• Bug Fixes

  • Fixed XML namespace structure preservation in EPUB metadata during translation for improved reader compatibility.

• Chores

  • Version bumped to v0.1.9.

Walkthrough

This PR updates project documentation and version information for release v0.1.9. Changes include restructuring README.md and README_zh-CN.md to emphasize bilingual EPUB output and add an online demo section, adding release notes documenting XML namespace preservation in EPUB metadata, and bumping the version number in pyproject.toml from 0.1.8 to 0.1.9. No code changes or API modifications are included.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• docs: sync README & update pyproject.toml #74: Modifies the same README documentation files with related content updates and organizational changes.
• docs: add changelog #126: Addresses sequential release updates with changelog and version bump changes in the same files.

🚥 Pre-merge checks | ✅ 1 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No pull request description was provided; however, the title is descriptive enough to convey the general intent of documentation updates.	Consider adding a brief description explaining the changes and their purpose, such as the reason for emphasizing bilingual EPUB output and adding demo links.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows the required format with type and subject, clearly describing the documentation changes (adding demo URL, preview, and updating header).

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