docs(v1): version page should recommend v2

[slorber]

Motivation

Because some users might think Docusaurus 1 site /next is actually v2, we should clarify.

#4042 (comment)

https://docusaurus.io/docs/en/next/docker

The above site is not V2 but is a bit misleading

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[github-actions]

Size Change: -2 B (0%)

Total Size: 26.8 kB

ℹ️ View Unchanged

Filename	Size	Change
website/build/blog/2017/12/14/introducing-docusaurus/index.html	20.8 kB	-1 B (0%)
website/build/docs/introduction/index.html	180 B	0 B
website/build/index.html	5.86 kB	-1 B (0%)

_{compressed-size-action}

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	79
🟢 Accessibility	99
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

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[yangshun]

Nice idea!

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