Mariya Sukhova

1) Document [double click actions](https://github.com/jmix-framework/jmix/issues/2582) 2) [URL Parameters for Filter in Column Headers](https://docs.jmix.io/jmix/whats-new/index.html#data-grid-url-parameters-for-filterin-column-headers) 3) [Column Visibility Control](https://docs.jmix.io/jmix/whats-new/index.html#data-grid-column-visibility-control)

The download URL was fixed in https://github.com/jmix-framework/jmix-docs/commit/ead182c411a18fc0df084f8e42e2682176913208

Also describe how to create repositories in Studio. Information about this is available in **Support for Data Repositories** of **What's new** for 2.1