Add back dagster_world.mp4 video (#11763)

### Summary & Motivation In the shuffle of moving this back and forth from OSS <-> Dagster website the video got lost... ### How I Tested These Changes See video load: <img width="770" alt="Screen Shot 2023-01-18 at 11 20 47 AM" src="https://user-images.githubusercontent.com/2286579/213233289-a1591137-58df-4573-8b00-dbfccd67f7fd.png">
dagster-io · Jan 18, 2023 · 79ccff7 · 79ccff7
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commit 79ccff7
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diff --git a/js_modules/dagit/packages/app/public/Dagster_world.mp4 b/js_modules/dagit/packages/app/public/Dagster_world.mp4