Introduce Server-side editor API docs

[DawidKossowski]

Suggested merge commit message (convention)

Docs: Introduce Server-side editor API docs.

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Additional information

Do NOT merge it before CS releases the feature.

[Reinmar]

Just an idea – any chance for a simple system diagram that shows e.g. a scene like this (naming of things should probably be improved a bit):

graph TD
    %% User A and B
    subgraph Browser_A["Browser (user A)"]
        A1["Editor instance (user A)"]
    end

    subgraph Browser_B["Browser (user B)"]
        B1["Editor instance (user B)"]
    end

    %% Cloud Services
    subgraph Cloud["Cloud Services"]
        C1["Editor instance (virtual user)"]
        CS["Collaboration Server"]
    end

    %% Application Backend
    Backend["Application backend (your system)"]

    %% Connections
    A1 --> CS
    B1 --> CS
    C1 --> CS
    Backend -->|Server-side Editor API| C1

[godai78]

Looks like the CS part has been merged: https://github.com/cksource/docs/pull/760

[godai78]

Changes in CS have been temporarily retracted.

[jflakus-cksource]

Docs are available on prod: https://ckeditor.com/docs/cs/latest/guides/collaboration/server-side-editor-api.html

[Witoso]

Are we rebasing to release?

[godai78]

Are we rebasing to release?

No real need to do that. We may merge it now, "as is," just as well. Unless we specifically want to ship it with the release for some reason.

[Witoso]

Please plan the merge of it 😊