Create editor presets for interoperability with other services

[essential-randomness]

Allow to create an editor that allows only to input what's translatable to and from e.g. GitHub.

Something like

import { GITHUB_SETTINGS } from "@editor/presets";

<Editor settings={GITHUB_SETTINGS} / onUpdate=((editorOutput) => {
  // editorOutput is guaranteed to only contain elements that can also be displayed on GitHub.
  // For example, given that GitHub is not able to embed videos, video embedding will be disabled as
  // an input in this Editor instance.
}) >