Mark all Vue 2 content with disclaimer about docs HOT 6 CLOSED

My impression was we'd have a dedicated site (e.g. v2.vuejs.org) for Vue 2 content. Is it not true?

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@phanan Absolutely. But I think we migrated some content into the docs-next repo that contains v2 info and hasn't been updated to v3 right?

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Not that I'm aware of TBH — @NataliaTepluhina might know better. Even if it's the case, we should "upgrade" those content instead.

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@phanan I think you've done the most migration work from the old docs to this one. Were all of them updated when you migrated them over? I know the SSR one needs this flag at the moment before we publish, but I didn't get a chance to review the others ones you migrated.

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All content migrated by me (which is much less than @NataliaTepluhina's 😬) should be in Vue 3. SSR needs to be catered later on in deed, but only for the external content at https://ssr.vuejs.org, not the vuejs.org part. @NataliaTepluhina how about yours?

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It seems like we're okay on this, so closing this issue unless we run into problems with outdated content.

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