docs: Add link to Learning Resources

[takuma-ru]

Japanese language study articles have been created and added to the Learning Resources page.

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[antfu]

素晴らしい記事です。書いてくれてありがとう！

[pkg-pr-new]

Open in Stackblitz

@slidev/client

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/client@1954

create-slidev

pnpm add https://pkg.pr.new/slidevjs/slidev/create-slidev@1954

@slidev/parser

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/parser@1954

create-slidev-theme

pnpm add https://pkg.pr.new/slidevjs/slidev/create-slidev-theme@1954

@slidev/cli

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/cli@1954

@slidev/types

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/types@1954

commit: 5057231