Add a share button in a petition's page

[agentspecial008]

We want to add on any petition's webpage a sharing wiidget, which allow an user to post the petition on a social media or to copy the petition's path on his clipboard by clicking on the appropriate button :

Thanks for your support !

[fallen]

Pretty recently the "social network share" buttons feature has been added. @agentspecial008 Is there something missing in your opinion or is it good like this? Take as example this petition: https://petition.antipub.org/petition/org/rap-rouen/interdisons-les-ecrans-publicitaires-numeriques-dans-rouen-metropole

[fallen]

For now I mark this one as closed. Please reopen it if something is missing.