Add introduction video to README and docs homepage

[wolfoo2931]

Summary by CodeRabbit

• Documentation
  • Added a linked YouTube introduction thumbnail near the top of the README.
  • Embedded an introductory YouTube video on the documentation homepage with responsive display and fullscreen support.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 46c629ef-6b75-41cf-aace-31868f3725d9

📥 Commits

Reviewing files that changed from the base of the PR and between 11fb3a5 and e432ab6.

📒 Files selected for processing (2)

• Readme.md
• docs/content/docs/index.mdx

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📝 Walkthrough

Walkthrough

The README now links to a YouTube introduction thumbnail. The documentation index embeds the same video in a responsive iframe with playback permissions and fullscreen support.

Changes

Introduction video documentation

Layer / File(s)	Summary
Add introduction video links and embed Readme.md, docs/content/docs/index.mdx	The README adds a linked YouTube thumbnail. The documentation index adds a responsive YouTube iframe with playback and fullscreen support.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the addition of an introduction video to both the README and documentation homepage.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add_video

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 ESLint

If the error stems from missing dependencies, add them to the package.json file. For unrecoverable errors (e.g., due to private dependencies), disable the tool in the CodeRabbit configuration.

docs/content/docs/index.mdx

(node:2) ESLintIgnoreWarning: The ".eslintignore" file is no longer supported. Switch to using the "ignores" property in "eslint.config.js": https://eslint.org/docs/latest/use/configure/migration-guide#ignoring-files
(Use node --trace-warnings ... to show where the warning was created)

Oops! Something went wrong! :(

ESLint: 9.39.2

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './core-web-vitals.js' is not defined by "exports" in /docs/node_modules/eslint-config-next/package.json imported from /docs/eslint.config.mjs
at exportsNotFound (node:internal/modules/esm/resolve:310:10)
at packageExportsResolve (node:internal/modules/esm/resolve:658:9)
at packageResolve (node:internal/modules/esm/resolve:770:12)
at moduleResolve (node:internal/modules/esm/resolve:855:18)
at defaultResolve (node:internal/modules/esm/resolve:988:11)
at #cachedDefaultResolve (node:internal/modules/esm/loader:697:20)
at #resolveAndMaybeBlockOnLoaderThread (node:internal/modules/esm/loader:714:38)
at ModuleLoader.resolveSync (node:internal/modules/esm/loader:746:52)
at #resolve (node:internal/modules/esm/loader:679:17)
at ModuleLoader.getOrCreateModuleJob (node:internal/modules/esm/loader:599:35)

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