docs: add slidev-addon-naive to addons gallery

[sghuang19]

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[sghuang19]

Just made the addon support dark theme. Now I would be happy to recommend it to everyone.

[pkg-pr-new]

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@slidev/client

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/client@2035

@slidev/parser

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/parser@2035

@slidev/cli

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/cli@2035

@slidev/types

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/types@2035

create-slidev

npm i https://pkg.pr.new/slidevjs/slidev/create-slidev@2035

create-slidev-theme

npm i https://pkg.pr.new/slidevjs/slidev/create-slidev-theme@2035

commit: 34d958c