chore!: remove prism support

[KermanX]

Targeting v0.50. resolves #1390

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[pkg-pr-new]

Open in Stackblitz

@slidev/client

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/client@1700

create-slidev-theme

pnpm add https://pkg.pr.new/slidevjs/slidev/create-slidev-theme@1700

create-slidev

pnpm add https://pkg.pr.new/slidevjs/slidev/create-slidev@1700

@slidev/parser

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/parser@1700

@slidev/cli

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/cli@1700

@slidev/types

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/types@1700

commit: 3efb6c2