Add clickable timestamps to Timeline demo

[Copilot]

This PR adds clickable timestamps to the Timeline demo page following the same pattern used in the Recorder demo.

Changes:

• Updated packages/docs/docs/timeline/demo.mdx to wrap timestamps with JumpToVideoLink components
• Converted static text like 00:17 - Description to <JumpToVideoLink>00:17</JumpToVideoLink> - Description
• Applied to all 4 timestamps in the Timeline demo

Before:

00:17 - Copying the Remotion Timeline implementation into the main app codebase  
00:41 - Setting up Tailwind theme  
01:03 - Integrating the Timeline code into the app  
01:50 - Customizing colors (adding a light theme)

After:

<JumpToVideoLink>00:17</JumpToVideoLink> - Copying the Remotion Timeline implementation into the main app codebase
<JumpToVideoLink>00:41</JumpToVideoLink> - Setting up Tailwind theme
<JumpToVideoLink>01:03</JumpToVideoLink> - Integrating the Timeline code into the app
<JumpToVideoLink>01:50</JumpToVideoLink> - Customizing colors (adding a light theme)

This provides the same user experience as the Recorder demo, allowing users to click on timestamps to jump to specific parts of the video.

Fixes #5465.

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Name	Status	Preview	Comments	Updated (UTC)
bugs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 24, 2025 9:36am
remotion	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 24, 2025 9:36am