Upgrade site building components (and clean up)

[hoch]

This PR includes several improvements to the site's build process and content:

• Upgrade (major version up) Eleventy and Tailwind CSS
• Refactored build process: The build process has been updated to dynamically generate build information (commit hash, version, etc.) at build time, rather than relying on a static build_info.json file. This simplifies the build process and ensures that the build information is always up-to-date.
• Updated content: The descriptions for the AudioWorklet and landing pages have been revised for clarity and accuracy.
  Dependency updates: Several dependencies have been updated to their latest versions.
• Cleanup: Broken links on the index pages have been unlinked.

Fixes: #410, #406, #401, #400, #367

[mjwilson-google]

Generally looks good to me, but it seems like the build integration is failing.

[tushar1977]

Is this issue is resolved? or can i fix this?

[hoch]

@tushar1977 This is a large scale infra change and it needs some testing in GitHub CI. Thanks for your offer, but this is already in progress.

[hoch]

Two Playwright test now time out:
src/tests/playwright/pages/perf-timeline-insert-event.html
src/tests/playwright/pages/perf-audio-worklet-node.html

Tried to debug the root cause of the problem, but couldn't figure it out. I will open an issue to investigate.