feat: add danmuku plugin documentation and i18n setup guide

- Created a new documentation file for the danmuku plugin, detailing its usage and providing code examples.
- Added a comprehensive guide for language settings (i18n), including instructions for importing languages, setting default languages, and modifying language options.
- Included code snippets for initializing the Artplayer with different languages and examples for adding new languages.

docs/document/assets/en_advanced_plugin.md.BJZpA8dL.lean.js

@@ -0,0 +1 @@
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