feat: add danmuku plugin documentation and i18n setup guide

- Created a new documentation file for the danmuku plugin with code examples.
- Added comprehensive language settings documentation, including default languages, importing languages, adding new languages, and modifying existing languages.
- Updated the structure of the i18n documentation to improve clarity and usability.

package.json

@@ -35,7 +35,7 @@
     "lint": "npx eslint packages/*/{src,types,package.json} --fix",
     "dev": "npx cross-env NODE_ENV=development node ./scripts/dev.js",
     "build": "npx cross-env NODE_ENV=production node ./scripts/build.js",
-    "build:all": "npm run build all && npm run build:i18n && npm run build:ts && npm run build:docs"
+    "build:all": "npm run build all && npm run build:i18n && npm run build:ts"
   },
   "browserslist": "last 1 Chrome version",
   "dependencies": {