Add docs for the Renderer API

[ArmandPhilippot]

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Description (required)

Adds a new reference page for the Renderer API:

• move some types from the Integration API to the new Renderer API (some have been reworded, not all)
• reuse a structure similar to that of the Adapter API to explain how to build a renderer

Things I'm not sure of:

• Renderers are not only for UI Framework but for file formats such as MDX. Is there a term to describe that?
• It seems /en/reference/renderer-reference existed before, so I had to update the redirections. I'm not sure how Netlify handles them... maybe we want another slug for the page to avoid any conflicts?
• I also wonder if it wouldn't make sense to have a new sidebar group for integration-related APIs instead of lengthening the list in "Other development APIs"?

Integrations reference
    Integration API
    Adapter API
    Renderer API

Related issues & labels (optional)

• Closes Document the renderer API #13199
• Suggested label: add new content

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.