README.md: link to static video asset for PyPI, etc

[masenf]

Updated video link in README for image generation app.

1. embedded video must be hosted as a github attachment to be rendered inline on github
2. <video> does not render on PyPI so it falls back to the link+img
3. embedded video link is not accessible directly, so also host the video on R2 bucket so link works

[greptile-apps]

Greptile Summary

This PR updates the fallback link for the image-generation demo video in README.md. The <video> element keeps its GitHub attachment as the playback source (works on GitHub), while the inner <a> fallback href is changed to a directly accessible R2-hosted URL so it works on PyPI and other renderers that don't support inline <video>.

• The src on the <video> tag is unchanged; only the <a href> inside the fallback content is updated to https://web.reflex-assets.dev/video/reflex-dalle-video-2x.mp4.
• No code or logic is affected; this is a documentation-only change.

Confidence Score: 5/5

Safe to merge — a single-line documentation change with no effect on code or runtime behavior.

The change is confined to the fallback anchor inside a <video> tag in README.md. It swaps one URL for another that is publicly hosted on the project's own R2 bucket, matching the stated intent. No logic, tests, or generated artifacts are touched.

No files require special attention.

Important Files Changed

Filename	Overview
README.md	Single-line change replacing the fallback anchor href inside a <video> tag from a non-directly-accessible GitHub attachment URL to a publicly hosted R2 bucket URL

_{Reviews (1): Last reviewed commit: "README.md: link to static video asset fo..." | Re-trigger Greptile}

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks

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_{Comparing masenf/readme-video-link (d87661b) with main (3b70322)}