Spaces in serverless

[joepeeples]

Contributes to https://github.com/elastic/security-docs-internal/issues/31.

🚧 Very much a Work In Progress! 🚧

Still need to:

• Enclose in conditionals to hide behind feature flag (?)
• Create feature flag variable in docs-site (?)
• Find & fix other major references to spaces that we previously omitted
• Link to general serverless docs on spaces, to be added in Spaces docs for serverless docs-content#55

? == Maybe don't bother with conditionals & flags for this; just keep the PR open until the feature is promoted to Prod?

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