Niklas Natter

#### What's in this PR? This PR updates the `jest` package from version 26 to version 27. See the [official release blog](https://jestjs.io/blog/2021/05/25/jest-27) for a list of changes between the versions.

Outdated javascript dependencies

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Unfortunately, we cannot update some javascript packages because of various reasons. This issue tracks which packages are affected and why we need to use an outdated package version: | Package...

Javascript setup is not compatible with npm 7 / 8

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The javascript setup in the `assets/admin` folder uses the `file:...` syntax to require Sulu packages such as the `sulu-admin-bundle`: https://github.com/sulu/skeleton/blob/c9640ee7dae09f09a84d83fce0b5143d52fc4a84/assets/admin/package.json#L15-L28 Dependencies that are required like this will be symlinked into...

[Example] Adjust ckeditor configuration

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#### What's in this PR? This PR demonstrates how to configure the ckeditor instance which is used for `text_editor` properties. It utilizes the [`ckeditorPluginRegistry` and `ckeditorConfigRegistry`](https://jsdocs.sulu.io/latest/#ckeditor5) of Sulu to add...

[Example] Assign route to custom entity

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#### What's in this PR? This PR demonstrates how to add a route to a custom entity using the [`route` content type](https://docs.sulu.io/en/latest/reference/content-types/route.html) and the [`RouteBundle`](https://docs.sulu.io/en/latest/bundles/route/index.html). This PR builds upon #84....

#### What's in this PR? This PR demonstrates how to add a `selection` and `single_selection` content-type for a custom entity. The content-types allow to select one or multiple entities inside...

#### What's in this PR? This PR demonstrates how to integrate an entity into the administration interface of Sulu. The example implements a simple `Event` entity that consists of a...

#### What's in this PR? This PR demonstrates how to integrate a global `ApplicationSettings` entity into the administration interface of Sulu. The entity is persisted using [Doctrine](https://www.doctrine-project.org/) and the API...

#### What's in this PR? This PR demonstrates how to add an additional tab to the the built-in contact entity. The example [extends the contact entity](https://docs.sulu.io/en/latest/cookbook/extend-entities.html) to include two project-specific...

#### What's in this PR? This PR demonstrates how to add a custom item action to a list view of the administration interface of Sulu. The example adds a simple...