Merge branch 'oembed-widget' into 'dev'

add oEmbed widget documentation

See merge request documentation/doc!50

source/import_documentation/Widgets/Reference.rst

@@ -91,3 +91,4 @@ Features to add to the widget. You can choose as many as you want
 -  ``addable``: adds a ``<solid-form>`` that allows to add data on the field concerned. 
    It accepts attributes from :ref:`solid-form <solid-form>` by using ``addable-[field]-[attribute]="value"`` format.
    If ``addable-data-src`` is not provided, the solid-form will use the URI in ``range-[field]`` as data-src, if declared. 
+-  ``oembed``: displays the video content of an oEmbed link filled with the associated ``value-[field]`` attribute.
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