Revert overflow: overlay (revert #21850) (#25231)

It causes not only one issue like #25221 (the footer width was also
affected by that change and was fixed some time ago)

The problem of "overflow: overlay" (#21850) is:

* It's not widely supported and is non-standard
https://caniuse.com/css-overflow-overlay
* It's not widely tested in Gitea (some standard layout like `ui
container + ui grid` may break it).
* The benefit seems smaller than the problems it brings.

So, I think it is good to revert it.

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Let's leave enough time for testing and reviewing.

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Co-authored-by: Giteabot <teabot@gitea.io>
Co-authored-by: silverwind <me@silverwind.io>
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wxiaoguang 2023-06-14 03:17:14 +08:00 committed by GitHub
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