refs https://github.com/TryGhost/Ghost/issues/9311
- very basic implementation, still needs proper classes and default stylesheet implementation
- change image card output to a `<figure>` with optional `<figcaption>`
- add optional `<p>` caption output to the html card
requires https://github.com/TryGhost/Ghost-Admin/pull/916
- add "enableDeveloperExperiments" config flag
- allow any HTML payload through in the HTML mobiledoc card
- same approach as taken in the markdown card, running the markup through SimpleDOM isn't necessary and is prone to breaking because of it's limited parsing and error handling abilities
To use Koenig modify your `config.development.json` file and add the following flag to the top-level object:
```
"enableDeveloperExperiments": true
```
If you restart the dev server you will then see a new section on the Labs screen with a Koenig Editor checkbox to enable/disable the editor.
⚠️ The editor is in a _very_ broken state, it's there for developer testing and on-going development. _Do not_ try to use this on any production data!
