Renomme correctement les modules `social.*` #2013

Job	Run time
Lint	2m 8s
Lint and build front-end	1m 34s
Build Sphinx documentation	1m 19s
Install and test zds-site (zds.tutorialv2)	8m 39s
Install and test zds-site (zds.member zds.gallery zds.searchv2 zds.middlewares zds.pages)	5m 24s
Install and test zds-site (zds.forum zds.featured zds.mp zds.notification zds.utils)	6m 14s
Push coverage to Coveralls	9s
Push documentation to GitHub Pages	0s
	25m 27s

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