feat: document addClientRenderer

[ematipico]

Description (required)

This PR documents a API that was added to the container API

withastro/astro#11486

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[sarah11918]

Left an initial review edit to see what you think, @ematipico !

I think there's so much in common here that it really can be the same section about adding renderers manually. See how you think this feels, and adjust if it's not accurate in some way!

[ematipico]

Thank you @sarah11918, I like the new edits! I still think we should add the :::caution block because the order matters.

It isn't possible to use addClientRenderer before addServerRenderer. The function addServerRenderer must be called first.

[sarah11918]

Ah, cool. I didn't get that the order mattered. Let me get back to that then! Thank you!