📚 Use videos instead of GIFs to show the setup process

GitHub now supports video uploads that can be embedded in the Markdown.

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Ref / See also:

 * https://github.blog/2021-05-13-video-uploads-available-github/
 * https://www.youtube.com/watch?v=G3Cytlicv8Y

README.md

@@ -54,9 +54,10 @@ The setup process will:
 
 Setup process in action:
 
-| ![Setup process on macOS][setup macos] | ![Setup process on Ubuntu][setup ubuntu] |
+<!-- markdownlint-disable MD033 -->
+| <video src="https://user-images.githubusercontent.com/1223565/236653425-5beae04a-39e3-4f29-8113-009e402818e6.mp4" title="Setup process on macOS"/> |<video src="https://user-images.githubusercontent.com/1223565/236653424-1702c359-1b68-4815-b3cc-96f6665c5e88.mp4" title="Setup process on Ubuntu"/> |
 |:---:|:---:|
-| macOS | Ubuntu |
+<!-- markdownlint-enable MD033 -->
 
 Screenshots
 -----------
@@ -199,9 +200,7 @@ The code is available under the [MIT license][license].
 [preferences macos]: src/os/preferences/macos
 [preferences ubuntu]: src/os/preferences/ubuntu
 [repo]: https://github.com/alrra
-[setup macos]: https://cloud.githubusercontent.com/assets/1223565/19314446/cd89a592-90a2-11e6-948d-9d75247088ba.gif
 [setup script]: https://github.com/alrra/dotfiles/blob/main/src/os/setup.sh#L3
-[setup ubuntu]: https://user-images.githubusercontent.com/1223565/101978032-d0791a80-3c06-11eb-8870-661d0eb3f543.gif
 [setup]: src/os/setup.sh
 [shell]: src/shell
 [symlink]: src/os/create_symbolic_links.sh