Fixed installation command for VuePress (2.0.0-beta.49) in docs

[darkRaspberry]

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Type Of Change

• [ ] 🐞 Bug fix (non-breaking change which fixes an issue)
• [ ] ✨ New feature (non-breaking change which adds functionality)
• [x] 📝 Document (This change requires a documentation update)
• [ ] 🎨 Theme style (Theme style beautification)
• [ ] ⚠ Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] 🔨 Workflow (Workflow changes)

Clear Describe

A clear and concise description of what update for target.

Fixed vuepress installation command of VuePress (2.0.0-beta.49).

Description

What's fixed:

• pnpm Vuepress installtion command
• yarn Vuepress installation command
• npm Vuepress installation command Refer to docs - vuepress

Test Case

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test case.

[vercel[bot]]

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Name	Status	Preview	Updated
v2-vuepress-theme-gungnir	✅ Ready (Inspect)	Visit Preview	Aug 21, 2022 at 2:31AM (UTC)
vuepress-theme-gungnir	❌ Failed (Inspect)		Aug 21, 2022 at 2:31AM (UTC)

[darkRaspberry]

According to docs

With pnpm, you may need to install vue and @vuepress/client as peer-dependencies, i.e. pnpm add -D vue @vuepress/client@next.

[Renovamen]

Thanks!