[docs] Update advanced-topics on SSR cache

[smyrick]

Add docs section on SSR cache

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[phryneas]

Hey Shane, thanks for the PR!

For now, we've decided that we want to highlight the existing warnings on SSR page more - see #11960

As for anything beyond that, I'll take this information and will see that I incorporate it more with #11807 - because in that PR we will create a full "SSR" section in the docs. That will probably give these warnings more visibility than adding them to the general-purpose "advanced topics" page.

For that reasons, I'm gonna close this PR - thank you for bringing this up! :)