feat: Ship docs directly at `vite-plus/docs`. #5189

Job	Run time
detect-changes	22s
download-previous-rolldown-binaries	10s
Build vite-plus packages (windows-latest)	6m 13s
Build vite-plus packages (ubuntu-latest)	6m 7s
${{ matrix.project.name }} E2E test (${{ matrix.os }})	1s
Notify on failure	1s
	12m 54s

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