Update JS dependencies (#15591)

* Update JS dependencies

- Update all JS dependencies
- Regenerate SVGs
- Remove unused postcss dependency
- Remove removed webpack option

* re-add postcss

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

public/img/svg/octicon-megaphone.svg

@@ -1 +1 @@
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