docs: fix rendering order of Styling docs

[DoK6n]

Description

In the Core concepts > Styling tab of the official document, if you apply the example of emotion and styled-component, styling will not be applied.
You need to change the order of ThemeProvider and AllStyledComponent for it to take effect. So I've edited this part of the documentation.

Also, in emotion and styled-component, @remirror/styles was raised to the top because the phrase that install is required is at the end of the document, so you may not be able to find it.

Checklist

• I have read the contributing document.
• My code follows the code style of this project and pnpm fix completed successfully.
• I have updated the documentation where necessary.
• New code is unit tested and all current tests pass when running pnpm test.

Screenshots

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Latest commit: a51aa23

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[ronnyroeller]

LGTM

[ronnyroeller]

Thanks a lot for your contribution, @DoK6n !