Share document to followers

Currently, followers of a user are notified automatically of the creation and modification of page created/modified by the followed user.

This behavior is dangerous for multiple reasons:

• The chances are good that followers might be spammed by minimal editions, without the followed user even knowing being spamming her followers.
• The creation/modification even are currently triggered implicitly on some evens, such as importing an image on a document, triggering the notification of pages without the followed user knowledge.

We propose to switch to a manual notification, where the followed user have to explicitly do the action to notify her followers.

This action will be placed in the drop down menu at the to-right of a XWiki page (see attachment).

Once the share action clicked, a modal window is proposed to the user, who can select the receiver (followers/public/users).

The activity type send to the fediverse is Create in a first time. We will swtich to the Announce type (https://www.w3.org/TR/activitypub/#announce-activity-inbox) once it is integrated to the extension.